chore(semantic): checkpoint remediation progress

2026-03-15 21:08:00 +03:00
parent 15d3141aef
commit 84a2cd5429
25 changed files with 1935 additions and 1559 deletions
--- a/backend/src/api/auth.py
+++ b/backend/src/api/auth.py
@@ -1,10 +1,11 @@
 # [DEF:backend.src.api.auth:Module]
 #
+# @TIER:      STANDARD
 # @SEMANTICS: api, auth, routes, login, logout
 # @PURPOSE:   Authentication API endpoints.
 # @LAYER:     API
-# @RELATION:  USES -> backend.src.services.auth_service.AuthService
-# @RELATION:  USES -> backend.src.core.database.get_auth_db
+# @RELATION:  USES ->[backend.src.services.auth_service.AuthService]
+# @RELATION:  USES ->[backend.src.core.database.get_auth_db]
 #
 # @INVARIANT: All auth endpoints must return consistent error codes.

@@ -23,11 +24,13 @@ import starlette.requests
 # [/SECTION]

 # [DEF:router:Variable]
+# @TIER: TRIVIAL
 # @PURPOSE: APIRouter instance for authentication routes.
 router = APIRouter(prefix="/api/auth", tags=["auth"])
 # [/DEF:router:Variable]

 # [DEF:login_for_access_token:Function]
+# @TIER: STANDARD
 # @PURPOSE: Authenticates a user and returns a JWT access token.
 # @PRE:     form_data contains username and password.
 # @POST:    Returns a Token object on success.
@@ -55,6 +58,7 @@ async def login_for_access_token(
 # [/DEF:login_for_access_token:Function]

 # [DEF:read_users_me:Function]
+# @TIER: STANDARD
 # @PURPOSE: Retrieves the profile of the currently authenticated user.
 # @PRE:     Valid JWT token provided.
 # @POST:    Returns the current user's data.
@@ -67,6 +71,7 @@ async def read_users_me(current_user: UserSchema = Depends(get_current_user)):
 # [/DEF:read_users_me:Function]

 # [DEF:logout:Function]
+# @TIER: STANDARD
 # @PURPOSE: Logs out the current user (placeholder for session revocation).
 # @PRE:     Valid JWT token provided.
 # @POST:    Returns success message.
@@ -80,6 +85,7 @@ async def logout(current_user: UserSchema = Depends(get_current_user)):
 # [/DEF:logout:Function]

 # [DEF:login_adfs:Function]
+# @TIER: STANDARD
 # @PURPOSE: Initiates the ADFS OIDC login flow.
 # @POST:    Redirects the user to ADFS.
@router.get("/login/adfs")
@@ -95,6 +101,7 @@ async def login_adfs(request: starlette.requests.Request):
 # [/DEF:login_adfs:Function]

 # [DEF:auth_callback_adfs:Function]
+# @TIER: STANDARD
 # @PURPOSE: Handles the callback from ADFS after successful authentication.
 # @POST:    Provisions user JIT and returns session token.
@router.get("/callback/adfs", name="auth_callback_adfs")
--- a/backend/src/api/routes/admin.py
+++ b/backend/src/api/routes/admin.py
@@ -4,8 +4,8 @@
 # @SEMANTICS: api, admin, users, roles, permissions
 # @PURPOSE:   Admin API endpoints for user and role management.
 # @LAYER:     API
-# @RELATION:  USES -> backend.src.core.auth.repository.AuthRepository
-# @RELATION:  USES -> backend.src.dependencies.has_permission
+# @RELATION:  [USES] ->[backend.src.core.auth.repository.AuthRepository]
+# @RELATION:  [USES] ->[backend.src.dependencies.has_permission]
 #
 # @INVARIANT: All endpoints in this module require 'Admin' role or 'admin' scope.

@@ -36,6 +36,7 @@ router = APIRouter(prefix="/api/admin", tags=["admin"])
 # [/DEF:router:Variable]

 # [DEF:list_users:Function]
+# @TIER: STANDARD
 # @PURPOSE: Lists all registered users.
 # @PRE:     Current user has 'Admin' role.
 # @POST:    Returns a list of UserSchema objects.
@@ -52,6 +53,7 @@ async def list_users(
 # [/DEF:list_users:Function]

 # [DEF:create_user:Function]
+# @TIER: STANDARD
 # @PURPOSE: Creates a new local user.
 # @PRE:     Current user has 'Admin' role.
 # @POST:    New user is created in the database.
@@ -89,6 +91,7 @@ async def create_user(
 # [/DEF:create_user:Function]

 # [DEF:update_user:Function]
+# @TIER: STANDARD
 # @PURPOSE: Updates an existing user.
@router.put("/users/{user_id}", response_model=UserSchema)
 async def update_user(
@@ -123,6 +126,7 @@ async def update_user(
 # [/DEF:update_user:Function]

 # [DEF:delete_user:Function]
+# @TIER: STANDARD
 # @PURPOSE: Deletes a user.
@router.delete("/users/{user_id}", status_code=status.HTTP_204_NO_CONTENT)
 async def delete_user(
@@ -146,6 +150,7 @@ async def delete_user(
 # [/DEF:delete_user:Function]

 # [DEF:list_roles:Function]
+# @TIER: STANDARD
 # @PURPOSE: Lists all available roles.
 # @RETURN:  List[RoleSchema] - List of roles.
 # @RELATION: CALLS -> backend.src.models.auth.Role
@@ -159,6 +164,7 @@ async def list_roles(
 # [/DEF:list_roles:Function]

 # [DEF:create_role:Function]
+# @TIER: STANDARD
 # @PURPOSE: Creates a new system role with associated permissions.
 # @PRE:     Role name must be unique.
 # @POST:    New Role record is created in auth.db.
@@ -196,6 +202,7 @@ async def create_role(
 # [/DEF:create_role:Function]

 # [DEF:update_role:Function]
+# @TIER: STANDARD
 # @PURPOSE: Updates an existing role's metadata and permissions.
 # @PRE:     role_id must be a valid existing role UUID.
 # @POST:    Role record is updated in auth.db.
@@ -240,6 +247,7 @@ async def update_role(
 # [/DEF:update_role:Function]

 # [DEF:delete_role:Function]
+# @TIER: STANDARD
 # @PURPOSE: Removes a role from the system.
 # @PRE:     role_id must be a valid existing role UUID.
 # @POST:    Role record is removed from auth.db.
@@ -266,6 +274,7 @@ async def delete_role(
 # [/DEF:delete_role:Function]

 # [DEF:list_permissions:Function]
+# @TIER: STANDARD
 # @PURPOSE: Lists all available system permissions for assignment.
 # @POST:    Returns a list of all PermissionSchema objects.
 # @PARAM:   db (Session) - Auth database session.
@@ -291,6 +300,7 @@ async def list_permissions(
 # [/DEF:list_permissions:Function]

 # [DEF:list_ad_mappings:Function]
+# @TIER: STANDARD
 # @PURPOSE: Lists all AD Group to Role mappings.
@router.get("/ad-mappings", response_model=List[ADGroupMappingSchema])
 async def list_ad_mappings(
@@ -302,6 +312,7 @@ async def list_ad_mappings(
 # [/DEF:list_ad_mappings:Function]

 # [DEF:create_ad_mapping:Function]
+# @TIER: STANDARD
 # @PURPOSE: Creates a new AD Group mapping.
@router.post("/ad-mappings", response_model=ADGroupMappingSchema)
 async def create_ad_mapping(
--- a/backend/src/api/routes/assistant.py
+++ b/backend/src/api/routes/assistant.py
@@ -3,8 +3,8 @@
 # @SEMANTICS: api, assistant, chat, command, confirmation
 # @PURPOSE: API routes for LLM assistant command parsing and safe execution orchestration.
 # @LAYER: API
-# @RELATION: DEPENDS_ON -> backend.src.core.task_manager
-# @RELATION: DEPENDS_ON -> backend.src.models.assistant
+# @RELATION: [DEPENDS_ON] ->[backend.src.core.task_manager.manager.TaskManager]
+# @RELATION: [DEPENDS_ON] ->[backend.src.models.assistant]
 # @INVARIANT: Risky operations are never executed without valid confirmation token.

 from __future__ import annotations
@@ -125,6 +125,7 @@ INTENT_PERMISSION_CHECKS: Dict[str, List[Tuple[str, str]]] = {


 # [DEF:_append_history:Function]
+# @TIER: STANDARD
 # @PURPOSE: Append conversation message to in-memory history buffer.
 # @PRE: user_id and conversation_id identify target conversation bucket.
 # @POST: Message entry is appended to CONVERSATIONS key list.
@@ -156,6 +157,7 @@ def _append_history(


 # [DEF:_persist_message:Function]
+# @TIER: STANDARD
 # @PURPOSE: Persist assistant/user message record to database.
 # @PRE: db session is writable and message payload is serializable.
 # @POST: Message row is committed or persistence failure is logged.
@@ -191,6 +193,7 @@ def _persist_message(


 # [DEF:_audit:Function]
+# @TIER: STANDARD
 # @PURPOSE: Append in-memory audit record for assistant decision trace.
 # @PRE: payload describes decision/outcome fields.
 # @POST: ASSISTANT_AUDIT list for user contains new timestamped entry.
@@ -203,6 +206,7 @@ def _audit(user_id: str, payload: Dict[str, Any]):


 # [DEF:_persist_audit:Function]
+# @TIER: STANDARD
 # @PURPOSE: Persist structured assistant audit payload in database.
 # @PRE: db session is writable and payload is JSON-serializable.
 # @POST: Audit row is committed or failure is logged with rollback.
@@ -226,6 +230,7 @@ def _persist_audit(db: Session, user_id: str, payload: Dict[str, Any], conversat


 # [DEF:_persist_confirmation:Function]
+# @TIER: STANDARD
 # @PURPOSE: Persist confirmation token record to database.
 # @PRE: record contains id/user/intent/dispatch/expiry fields.
 # @POST: Confirmation row exists in persistent storage.
@@ -251,6 +256,7 @@ def _persist_confirmation(db: Session, record: ConfirmationRecord):


 # [DEF:_update_confirmation_state:Function]
+# @TIER: STANDARD
 # @PURPOSE: Update persistent confirmation token lifecycle state.
 # @PRE: confirmation_id references existing row.
 # @POST: State and consumed_at fields are updated when applicable.
@@ -270,6 +276,7 @@ def _update_confirmation_state(db: Session, confirmation_id: str, state: str):


 # [DEF:_load_confirmation_from_db:Function]
+# @TIER: STANDARD
 # @PURPOSE: Load confirmation token from database into in-memory model.
 # @PRE: confirmation_id may or may not exist in storage.
 # @POST: Returns ConfirmationRecord when found, otherwise None.
@@ -295,6 +302,7 @@ def _load_confirmation_from_db(db: Session, confirmation_id: str) -> Optional[Co


 # [DEF:_ensure_conversation:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve active conversation id in memory or create a new one.
 # @PRE: user_id identifies current actor.
 # @POST: Returns stable conversation id and updates USER_ACTIVE_CONVERSATION.
@@ -314,6 +322,7 @@ def _ensure_conversation(user_id: str, conversation_id: Optional[str]) -> str:


 # [DEF:_resolve_or_create_conversation:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve active conversation using explicit id, memory cache, or persisted history.
 # @PRE: user_id and db session are available.
 # @POST: Returns conversation id and updates USER_ACTIVE_CONVERSATION cache.
@@ -343,6 +352,7 @@ def _resolve_or_create_conversation(user_id: str, conversation_id: Optional[str]


 # [DEF:_cleanup_history_ttl:Function]
+# @TIER: STANDARD
 # @PURPOSE: Enforce assistant message retention window by deleting expired rows and in-memory records.
 # @PRE: db session is available and user_id references current actor scope.
 # @POST: Messages older than ASSISTANT_MESSAGE_TTL_DAYS are removed from persistence and memory mirrors.
@@ -380,6 +390,7 @@ def _cleanup_history_ttl(db: Session, user_id: str):


 # [DEF:_is_conversation_archived:Function]
+# @TIER: STANDARD
 # @PURPOSE: Determine archived state for a conversation based on last update timestamp.
 # @PRE: updated_at can be null for empty conversations.
 # @POST: Returns True when conversation inactivity exceeds archive threshold.
@@ -392,6 +403,7 @@ def _is_conversation_archived(updated_at: Optional[datetime]) -> bool:


 # [DEF:_coerce_query_bool:Function]
+# @TIER: STANDARD
 # @PURPOSE: Normalize bool-like query values for compatibility in direct handler invocations/tests.
 # @PRE: value may be bool, string, or FastAPI Query metadata object.
 # @POST: Returns deterministic boolean flag.
@@ -405,6 +417,7 @@ def _coerce_query_bool(value: Any) -> bool:


 # [DEF:_extract_id:Function]
+# @TIER: STANDARD
 # @PURPOSE: Extract first regex match group from text by ordered pattern list.
 # @PRE: patterns contain at least one capture group.
 # @POST: Returns first matched token or None.
@@ -418,6 +431,7 @@ def _extract_id(text: str, patterns: List[str]) -> Optional[str]:


 # [DEF:_resolve_env_id:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve environment identifier/name token to canonical environment id.
 # @PRE: config_manager provides environment list.
 # @POST: Returns matched environment id or None.
@@ -435,6 +449,7 @@ def _resolve_env_id(token: Optional[str], config_manager: ConfigManager) -> Opti


 # [DEF:_is_production_env:Function]
+# @TIER: STANDARD
 # @PURPOSE: Determine whether environment token resolves to production-like target.
 # @PRE: config_manager provides environments or token text is provided.
 # @POST: Returns True for production/prod synonyms, else False.
@@ -452,6 +467,7 @@ def _is_production_env(token: Optional[str], config_manager: ConfigManager) -> b


 # [DEF:_resolve_provider_id:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve provider token to provider id with active/default fallback.
 # @PRE: db session can load provider list through LLMProviderService.
 # @POST: Returns provider id or None when no providers configured.
@@ -487,6 +503,7 @@ def _resolve_provider_id(


 # [DEF:_get_default_environment_id:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve default environment id from settings or first configured environment.
 # @PRE: config_manager returns environments list.
 # @POST: Returns default environment id or None when environment list is empty.
@@ -508,6 +525,7 @@ def _get_default_environment_id(config_manager: ConfigManager) -> Optional[str]:


 # [DEF:_resolve_dashboard_id_by_ref:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve dashboard id by title or slug reference in selected environment.
 # @PRE: dashboard_ref is a non-empty string-like token.
 # @POST: Returns dashboard id when uniquely matched, otherwise None.
@@ -550,6 +568,7 @@ def _resolve_dashboard_id_by_ref(


 # [DEF:_resolve_dashboard_id_entity:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve dashboard id from intent entities using numeric id or dashboard_ref fallback.
 # @PRE: entities may contain dashboard_id as int/str and optional dashboard_ref.
 # @POST: Returns resolved dashboard id or None when ambiguous/unresolvable.
@@ -581,6 +600,7 @@ def _resolve_dashboard_id_entity(


 # [DEF:_get_environment_name_by_id:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve human-readable environment name by id.
 # @PRE: environment id may be None.
 # @POST: Returns matching environment name or fallback id.
@@ -593,6 +613,7 @@ def _get_environment_name_by_id(env_id: Optional[str], config_manager: ConfigMan


 # [DEF:_extract_result_deep_links:Function]
+# @TIER: STANDARD
 # @PURPOSE: Build deep-link actions to verify task result from assistant chat.
 # @PRE: task object is available.
 # @POST: Returns zero or more assistant actions for dashboard open/diff.
@@ -649,6 +670,7 @@ def _extract_result_deep_links(task: Any, config_manager: ConfigManager) -> List


 # [DEF:_build_task_observability_summary:Function]
+# @TIER: STANDARD
 # @PURPOSE: Build compact textual summary for completed tasks to reduce "black box" effect.
 # @PRE: task may contain plugin-specific result payload.
 # @POST: Returns non-empty summary line for known task types or empty string fallback.
@@ -712,6 +734,7 @@ def _build_task_observability_summary(task: Any, config_manager: ConfigManager)


 # [DEF:_parse_command:Function]
+# @TIER: STANDARD
 # @PURPOSE: Deterministically parse RU/EN command text into intent payload.
 # @PRE: message contains raw user text and config manager resolves environments.
 # @POST: Returns intent dict with domain/operation/entities/confidence/risk fields.
@@ -905,6 +928,7 @@ def _parse_command(message: str, config_manager: ConfigManager) -> Dict[str, Any


 # [DEF:_check_any_permission:Function]
+# @TIER: STANDARD
 # @PURPOSE: Validate user against alternative permission checks (logical OR).
 # @PRE: checks list contains resource-action tuples.
 # @POST: Returns on first successful permission; raises 403-like HTTPException otherwise.
@@ -922,6 +946,7 @@ def _check_any_permission(current_user: User, checks: List[Tuple[str, str]]):


 # [DEF:_has_any_permission:Function]
+# @TIER: STANDARD
 # @PURPOSE: Check whether user has at least one permission tuple from the provided list.
 # @PRE: current_user and checks list are valid.
 # @POST: Returns True when at least one permission check passes.
@@ -935,6 +960,7 @@ def _has_any_permission(current_user: User, checks: List[Tuple[str, str]]) -> bo


 # [DEF:_build_tool_catalog:Function]
+# @TIER: STANDARD
 # @PURPOSE: Build current-user tool catalog for LLM planner with operation contracts and defaults.
 # @PRE: current_user is authenticated; config/db are available.
 # @POST: Returns list of executable tools filtered by permission and runtime availability.
@@ -1058,6 +1084,7 @@ def _build_tool_catalog(current_user: User, config_manager: ConfigManager, db: S


 # [DEF:_coerce_intent_entities:Function]
+# @TIER: STANDARD
 # @PURPOSE: Normalize intent entity value types from LLM output to route-compatible values.
 # @PRE: intent contains entities dict or missing entities.
 # @POST: Returned intent has numeric ids coerced where possible and string values stripped.
@@ -1082,6 +1109,7 @@ _SAFE_OPS = {"show_capabilities", "get_task_status", "get_health_summary"}


 # [DEF:_confirmation_summary:Function]
+# @TIER: STANDARD
 # @PURPOSE: Build human-readable confirmation prompt for an intent before execution.
 # @PRE: intent contains operation and entities fields.
 # @POST: Returns descriptive Russian-language text ending with confirmation prompt.
@@ -1177,6 +1205,7 @@ async def _async_confirmation_summary(intent: Dict[str, Any], config_manager: Co


 # [DEF:_clarification_text_for_intent:Function]
+# @TIER: STANDARD
 # @PURPOSE: Convert technical missing-parameter errors into user-facing clarification prompts.
 # @PRE: state was classified as needs_clarification for current intent/error combination.
 # @POST: Returned text is human-readable and actionable for target operation.
@@ -1200,6 +1229,7 @@ def _clarification_text_for_intent(intent: Optional[Dict[str, Any]], detail_text


 # [DEF:_plan_intent_with_llm:Function]
+# @TIER: STANDARD
 # @PURPOSE: Use active LLM provider to select best tool/operation from dynamic catalog.
 # @PRE: tools list contains allowed operations for current user.
 # @POST: Returns normalized intent dict when planning succeeds; otherwise None.
@@ -1310,6 +1340,7 @@ async def _plan_intent_with_llm(


 # [DEF:_authorize_intent:Function]
+# @TIER: STANDARD
 # @PURPOSE: Validate user permissions for parsed intent before confirmation/dispatch.
 # @PRE: intent.operation is present for known assistant command domains.
 # @POST: Returns if authorized; raises HTTPException(403) when denied.
@@ -1321,6 +1352,7 @@ def _authorize_intent(intent: Dict[str, Any], current_user: User):


 # [DEF:_dispatch_intent:Function]
+# @TIER: STANDARD
 # @PURPOSE: Execute parsed assistant intent via existing task/plugin/git services.
 # @PRE: intent operation is known and actor permissions are validated per operation.
 # @POST: Returns response text, optional task id, and UI actions for follow-up.
@@ -1642,6 +1674,7 @@ async def _dispatch_intent(

@router.post("/messages", response_model=AssistantMessageResponse)
 # [DEF:send_message:Function]
+# @TIER: STANDARD
 # @PURPOSE: Parse assistant command, enforce safety gates, and dispatch executable intent.
 # @PRE: Authenticated user is available and message text is non-empty.
 # @POST: Response state is one of clarification/confirmation/started/success/denied/failed.
@@ -1811,6 +1844,7 @@ async def send_message(

@router.post("/confirmations/{confirmation_id}/confirm", response_model=AssistantMessageResponse)
 # [DEF:confirm_operation:Function]
+# @TIER: STANDARD
 # @PURPOSE: Execute previously requested risky operation after explicit user confirmation.
 # @PRE: confirmation_id exists, belongs to current user, is pending, and not expired.
 # @POST: Confirmation state becomes consumed and operation result is persisted in history.
@@ -1877,6 +1911,7 @@ async def confirm_operation(

@router.post("/confirmations/{confirmation_id}/cancel", response_model=AssistantMessageResponse)
 # [DEF:cancel_operation:Function]
+# @TIER: STANDARD
 # @PURPOSE: Cancel pending risky operation and mark confirmation token as cancelled.
 # @PRE: confirmation_id exists, belongs to current user, and is still pending.
 # @POST: Confirmation becomes cancelled and cannot be executed anymore.
@@ -1933,6 +1968,7 @@ async def cancel_operation(


 # [DEF:list_conversations:Function]
+# @TIER: STANDARD
 # @PURPOSE: Return paginated conversation list for current user with archived flag and last message preview.
 # @PRE: Authenticated user context and valid pagination params.
 # @POST: Conversations are grouped by conversation_id sorted by latest activity descending.
@@ -2020,6 +2056,7 @@ async def list_conversations(


 # [DEF:delete_conversation:Function]
+# @TIER: STANDARD
 # @PURPOSE: Soft-delete or hard-delete a conversation and clear its in-memory trace.
 # @PRE: conversation_id belongs to current_user.
 # @POST: Conversation records are removed from DB and CONVERSATIONS cache.
--- a/backend/src/api/routes/dashboards.py
+++ b/backend/src/api/routes/dashboards.py
@@ -4,12 +4,17 @@
 # @SEMANTICS: api, dashboards, resources, hub
 # @PURPOSE:   API endpoints for the Dashboard Hub - listing dashboards with Git and task status
 # @LAYER:     API
-# @RELATION:  DEPENDS_ON -> backend.src.dependencies
-# @RELATION:  DEPENDS_ON -> backend.src.services.resource_service
-# @RELATION:  DEPENDS_ON -> backend.src.core.superset_client
+# @RELATION:  DEPENDS_ON ->[backend.src.dependencies:Dependencies]
+# @RELATION:  DEPENDS_ON ->[backend.src.services.resource_service:ResourceService]
+# @RELATION:  DEPENDS_ON ->[backend.src.core.superset_client:SupersetClient]
 #
 # @INVARIANT: All dashboard responses include git_status and last_task metadata
 #
+# @PRE: Valid environment configurations exist in ConfigManager.
+# @POST: Dashboard responses are projected into DashboardsResponse DTO.
+# @SIDE_EFFECT: Performs external calls to Superset API and potentially Git providers.
+# @DATA_CONTRACT: Input(env_id, filters) -> Output(DashboardsResponse)
+#
 # @TEST_CONTRACT: DashboardsAPI -> {
 #    required_fields: {env_id: string, page: integer, page_size: integer},
 #    optional_fields: {search: string},
@@ -61,6 +66,8 @@ from ...services.resource_service import ResourceService
 router = APIRouter(prefix="/api/dashboards", tags=["Dashboards"])

 # [DEF:GitStatus:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: DTO for dashboard Git synchronization status.
 class GitStatus(BaseModel):
    branch: Optional[str] = None
    sync_status: Optional[str] = Field(None, pattern="^OK|DIFF|NO_REPO|ERROR$")
@@ -69,6 +76,8 @@ class GitStatus(BaseModel):
 # [/DEF:GitStatus:DataClass]

 # [DEF:LastTask:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: DTO for the most recent background task associated with a dashboard.
 class LastTask(BaseModel):
    task_id: Optional[str] = None
    status: Optional[str] = Field(
@@ -79,6 +88,8 @@ class LastTask(BaseModel):
 # [/DEF:LastTask:DataClass]

 # [DEF:DashboardItem:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: DTO representing a single dashboard with projected metadata.
 class DashboardItem(BaseModel):
    id: int
    title: str
@@ -93,6 +104,8 @@ class DashboardItem(BaseModel):
 # [/DEF:DashboardItem:DataClass]

 # [DEF:EffectiveProfileFilter:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: Metadata about applied profile filters for UI context.
 class EffectiveProfileFilter(BaseModel):
    applied: bool
    source_page: Literal["dashboards_main", "other"] = "dashboards_main"
@@ -104,6 +117,8 @@ class EffectiveProfileFilter(BaseModel):
 # [/DEF:EffectiveProfileFilter:DataClass]

 # [DEF:DashboardsResponse:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: Envelope DTO for paginated dashboards list.
 class DashboardsResponse(BaseModel):
    dashboards: List[DashboardItem]
    total: int
@@ -114,6 +129,8 @@ class DashboardsResponse(BaseModel):
 # [/DEF:DashboardsResponse:DataClass]

 # [DEF:DashboardChartItem:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: DTO for a chart linked to a dashboard.
 class DashboardChartItem(BaseModel):
    id: int
    title: str
@@ -124,6 +141,8 @@ class DashboardChartItem(BaseModel):
 # [/DEF:DashboardChartItem:DataClass]

 # [DEF:DashboardDatasetItem:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: DTO for a dataset associated with a dashboard.
 class DashboardDatasetItem(BaseModel):
    id: int
    table_name: str
@@ -134,6 +153,8 @@ class DashboardDatasetItem(BaseModel):
 # [/DEF:DashboardDatasetItem:DataClass]

 # [DEF:DashboardDetailResponse:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: Detailed dashboard metadata including children.
 class DashboardDetailResponse(BaseModel):
    id: int
    title: str
@@ -149,6 +170,8 @@ class DashboardDetailResponse(BaseModel):
 # [/DEF:DashboardDetailResponse:DataClass]

 # [DEF:DashboardTaskHistoryItem:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: Individual history record entry.
 class DashboardTaskHistoryItem(BaseModel):
    id: str
    plugin_id: str
@@ -161,12 +184,16 @@ class DashboardTaskHistoryItem(BaseModel):
 # [/DEF:DashboardTaskHistoryItem:DataClass]

 # [DEF:DashboardTaskHistoryResponse:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: Collection DTO for task history.
 class DashboardTaskHistoryResponse(BaseModel):
    dashboard_id: int
    items: List[DashboardTaskHistoryItem]
 # [/DEF:DashboardTaskHistoryResponse:DataClass]

 # [DEF:DatabaseMapping:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: DTO for cross-environment database ID mapping.
 class DatabaseMapping(BaseModel):
    source_db: str
    target_db: str
@@ -176,12 +203,15 @@ class DatabaseMapping(BaseModel):
 # [/DEF:DatabaseMapping:DataClass]

 # [DEF:DatabaseMappingsResponse:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: Wrapper for database mappings.
 class DatabaseMappingsResponse(BaseModel):
    mappings: List[DatabaseMapping]
 # [/DEF:DatabaseMappingsResponse:DataClass]


 # [DEF:_find_dashboard_id_by_slug:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve dashboard numeric ID by slug using Superset list endpoint.
 # @PRE: `dashboard_slug` is non-empty.
 # @POST: Returns dashboard ID when found, otherwise None.
@@ -209,6 +239,7 @@ def _find_dashboard_id_by_slug(


 # [DEF:_resolve_dashboard_id_from_ref:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve dashboard ID from slug-first reference with numeric fallback.
 # @PRE: `dashboard_ref` is provided in route path.
 # @POST: Returns a valid dashboard ID or raises HTTPException(404).
@@ -233,6 +264,7 @@ def _resolve_dashboard_id_from_ref(


 # [DEF:_find_dashboard_id_by_slug_async:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve dashboard numeric ID by slug using async Superset list endpoint.
 # @PRE: dashboard_slug is non-empty.
 # @POST: Returns dashboard ID when found, otherwise None.
@@ -260,6 +292,7 @@ async def _find_dashboard_id_by_slug_async(


 # [DEF:_resolve_dashboard_id_from_ref_async:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve dashboard ID from slug-first reference using async Superset client.
 # @PRE: dashboard_ref is provided in route path.
 # @POST: Returns valid dashboard ID or raises HTTPException(404).
@@ -283,6 +316,7 @@ async def _resolve_dashboard_id_from_ref_async(


 # [DEF:_normalize_filter_values:Function]
+# @TIER: STANDARD
 # @PURPOSE: Normalize query filter values to lower-cased non-empty tokens.
 # @PRE: values may be None or list of strings.
 # @POST: Returns trimmed normalized list preserving input order.
@@ -299,6 +333,7 @@ def _normalize_filter_values(values: Optional[List[str]]) -> List[str]:


 # [DEF:_dashboard_git_filter_value:Function]
+# @TIER: STANDARD
 # @PURPOSE: Build comparable git status token for dashboards filtering.
 # @PRE: dashboard payload may contain git_status or None.
 # @POST: Returns one of ok|diff|no_repo|error|pending.
@@ -318,6 +353,7 @@ def _dashboard_git_filter_value(dashboard: Dict[str, Any]) -> str:
 # [/DEF:_dashboard_git_filter_value:Function]

 # [DEF:_normalize_actor_alias_token:Function]
+# @TIER: STANDARD
 # @PURPOSE: Normalize actor alias token to comparable trim+lower text.
 # @PRE: value can be scalar/None.
 # @POST: Returns normalized token or None.
@@ -328,6 +364,7 @@ def _normalize_actor_alias_token(value: Any) -> Optional[str]:


 # [DEF:_normalize_owner_display_token:Function]
+# @TIER: STANDARD
 # @PURPOSE: Project owner payload value into stable display string for API response contracts.
 # @PRE: owner can be scalar, dict or None.
 # @POST: Returns trimmed non-empty owner display token or None.
@@ -354,6 +391,7 @@ def _normalize_owner_display_token(owner: Any) -> Optional[str]:


 # [DEF:_normalize_dashboard_owner_values:Function]
+# @TIER: STANDARD
 # @PURPOSE: Normalize dashboard owners payload to optional list of display strings.
 # @PRE: owners payload can be None, scalar, or list with mixed values.
 # @POST: Returns deduplicated owner labels preserving order, or None when absent.
@@ -378,6 +416,7 @@ def _normalize_dashboard_owner_values(owners: Any) -> Optional[List[str]]:


 # [DEF:_project_dashboard_response_items:Function]
+# @TIER: STANDARD
 # @PURPOSE: Project dashboard payloads to response-contract-safe shape.
 # @PRE: dashboards is a list of dict-like dashboard payloads.
 # @POST: Returned items satisfy DashboardItem owners=list[str]|None contract.
@@ -394,6 +433,7 @@ def _project_dashboard_response_items(dashboards: List[Dict[str, Any]]) -> List[


 # [DEF:_resolve_profile_actor_aliases:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve stable actor aliases for profile filtering without per-dashboard detail fan-out.
 # @PRE: bound username is available and env is valid.
 # @POST: Returns at least normalized username; may include Superset display-name alias.
@@ -458,6 +498,7 @@ def _resolve_profile_actor_aliases(env: Any, bound_username: str) -> List[str]:


 # [DEF:_matches_dashboard_actor_aliases:Function]
+# @TIER: STANDARD
 # @PURPOSE: Apply profile actor matching against multiple aliases (username + optional display name).
 # @PRE: actor_aliases contains normalized non-empty tokens.
 # @POST: Returns True when any alias matches owners OR modified_by.
@@ -479,6 +520,7 @@ def _matches_dashboard_actor_aliases(


 # [DEF:get_dashboards:Function]
+# @TIER: STANDARD
 # @PURPOSE: Fetch list of dashboards from a specific environment with Git status and last task status
 # @PRE: env_id must be a valid environment ID
 # @PRE: page must be >= 1 if provided
@@ -491,7 +533,7 @@ def _matches_dashboard_actor_aliases(
 # @PARAM: page (Optional[int]) - Page number (default: 1)
 # @PARAM: page_size (Optional[int]) - Items per page (default: 10, max: 100)
 # @RETURN: DashboardsResponse - List of dashboards with status metadata
-# @RELATION: CALLS -> ResourceService.get_dashboards_with_status
+# @RELATION: CALLS ->[ResourceService:get_dashboards_with_status]
@router.get("", response_model=DashboardsResponse)
 async def get_dashboards(
    env_id: str,
@@ -781,6 +823,7 @@ async def get_dashboards(
 # [/DEF:get_dashboards:Function]

 # [DEF:get_database_mappings:Function]
+# @TIER: STANDARD
 # @PURPOSE: Get database mapping suggestions between source and target environments
 # @PRE: User has permission plugin:migration:read
 # @PRE: source_env_id and target_env_id are valid environment IDs
@@ -788,7 +831,7 @@ async def get_dashboards(
 # @PARAM: source_env_id (str) - Source environment ID
 # @PARAM: target_env_id (str) - Target environment ID
 # @RETURN: DatabaseMappingsResponse - List of suggested mappings
-# @RELATION: CALLS -> MappingService.get_suggestions
+# @RELATION: CALLS ->[MappingService:get_suggestions]
@router.get("/db-mappings", response_model=DatabaseMappingsResponse)
 async def get_database_mappings(
    source_env_id: str,
@@ -836,10 +879,11 @@ async def get_database_mappings(
 # [/DEF:get_database_mappings:Function]

 # [DEF:get_dashboard_detail:Function]
+# @TIER: STANDARD
 # @PURPOSE: Fetch detailed dashboard info with related charts and datasets
 # @PRE: env_id must be valid and dashboard ref (slug or id) must exist
 # @POST: Returns dashboard detail payload for overview page
-# @RELATION: CALLS -> SupersetClient.get_dashboard_detail
+# @RELATION: CALLS ->[AsyncSupersetClient:get_dashboard_detail_async]
@router.get("/{dashboard_ref}", response_model=DashboardDetailResponse)
 async def get_dashboard_detail(
    dashboard_ref: str,
@@ -873,6 +917,7 @@ async def get_dashboard_detail(


 # [DEF:_task_matches_dashboard:Function]
+# @TIER: STANDARD
 # @PURPOSE: Checks whether task params are tied to a specific dashboard and environment.
 # @PRE: task-like object exposes plugin_id and params fields.
 # @POST: Returns True only for supported task plugins tied to dashboard_id (+optional env_id).
@@ -906,6 +951,7 @@ def _task_matches_dashboard(task: Any, dashboard_id: int, env_id: Optional[str])


 # [DEF:get_dashboard_tasks_history:Function]
+# @TIER: STANDARD
 # @PURPOSE: Returns history of backup and LLM validation tasks for a dashboard.
 # @PRE: dashboard ref (slug or id) is valid.
 # @POST: Response contains sorted task history (newest first).
@@ -992,6 +1038,7 @@ async def get_dashboard_tasks_history(


 # [DEF:get_dashboard_thumbnail:Function]
+# @TIER: STANDARD
 # @PURPOSE: Proxies Superset dashboard thumbnail with cache support.
 # @PRE: env_id must exist.
 # @POST: Returns image bytes or 202 when thumbnail is being prepared by Superset.
@@ -1085,6 +1132,8 @@ async def get_dashboard_thumbnail(
 # [/DEF:get_dashboard_thumbnail:Function]

 # [DEF:MigrateRequest:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: DTO for dashboard migration requests.
 class MigrateRequest(BaseModel):
    source_env_id: str = Field(..., description="Source environment ID")
    target_env_id: str = Field(..., description="Target environment ID")
@@ -1094,11 +1143,14 @@ class MigrateRequest(BaseModel):
 # [/DEF:MigrateRequest:DataClass]

 # [DEF:TaskResponse:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: DTO for async task ID return.
 class TaskResponse(BaseModel):
    task_id: str
 # [/DEF:TaskResponse:DataClass]

 # [DEF:migrate_dashboards:Function]
+# @TIER: STANDARD
 # @PURPOSE: Trigger bulk migration of dashboards from source to target environment
 # @PRE: User has permission plugin:migration:execute
 # @PRE: source_env_id and target_env_id are valid environment IDs
@@ -1107,8 +1159,8 @@ class TaskResponse(BaseModel):
 # @POST: Task is created and queued for execution
 # @PARAM: request (MigrateRequest) - Migration request with source, target, and dashboard IDs
 # @RETURN: TaskResponse - Task ID for tracking
-# @RELATION: DISPATCHES -> MigrationPlugin
-# @RELATION: CALLS -> task_manager.create_task
+# @RELATION: DISPATCHES ->[MigrationPlugin:execute]
+# @RELATION: CALLS ->[task_manager:create_task]
@router.post("/migrate", response_model=TaskResponse)
 async def migrate_dashboards(
    request: MigrateRequest,
@@ -1159,6 +1211,8 @@ async def migrate_dashboards(
 # [/DEF:migrate_dashboards:Function]

 # [DEF:BackupRequest:DataClass]
+# @TIER: STANDARD
+# @PURPOSE: DTO for dashboard backup requests.
 class BackupRequest(BaseModel):
    env_id: str = Field(..., description="Environment ID")
    dashboard_ids: List[int] = Field(..., description="List of dashboard IDs to backup")
@@ -1166,6 +1220,7 @@ class BackupRequest(BaseModel):
 # [/DEF:BackupRequest:DataClass]

 # [DEF:backup_dashboards:Function]
+# @TIER: STANDARD
 # @PURPOSE: Trigger bulk backup of dashboards with optional cron schedule
 # @PRE: User has permission plugin:backup:execute
 # @PRE: env_id is a valid environment ID
@@ -1175,8 +1230,8 @@ class BackupRequest(BaseModel):
 # @POST: If schedule is provided, a scheduled task is created
 # @PARAM: request (BackupRequest) - Backup request with environment and dashboard IDs
 # @RETURN: TaskResponse - Task ID for tracking
-# @RELATION: DISPATCHES -> BackupPlugin
-# @RELATION: CALLS -> task_manager.create_task
+# @RELATION: DISPATCHES ->[BackupPlugin:execute]
+# @RELATION: CALLS ->[task_manager:create_task]
@router.post("/backup", response_model=TaskResponse)
 async def backup_dashboards(
    request: BackupRequest,
--- a/backend/src/api/routes/datasets.py
+++ b/backend/src/api/routes/datasets.py
@@ -4,9 +4,9 @@
 # @SEMANTICS: api, datasets, resources, hub
 # @PURPOSE:   API endpoints for the Dataset Hub - listing datasets with mapping progress
 # @LAYER:     API
-# @RELATION:  DEPENDS_ON -> backend.src.dependencies
-# @RELATION:  DEPENDS_ON -> backend.src.services.resource_service
-# @RELATION:  DEPENDS_ON -> backend.src.core.superset_client
+# @RELATION:  DEPENDS_ON ->[backend.src.dependencies]
+# @RELATION:  DEPENDS_ON ->[backend.src.services.resource_service]
+# @RELATION:  DEPENDS_ON ->[backend.src.core.superset_client]
 #
 # @INVARIANT: All dataset responses include last_task metadata

@@ -22,28 +22,39 @@ from ...core.superset_client import SupersetClient
 router = APIRouter(prefix="/api/datasets", tags=["Datasets"])

 # [DEF:MappedFields:DataClass]
+# @TIER: TRIVIAL
+# @PURPOSE: DTO for dataset mapping progress statistics
 class MappedFields(BaseModel):
    total: int
    mapped: int
 # [/DEF:MappedFields:DataClass]

 # [DEF:LastTask:DataClass]
+# @TIER: TRIVIAL
+# @PURPOSE: DTO for the most recent task associated with a dataset
 class LastTask(BaseModel):
    task_id: Optional[str] = None
    status: Optional[str] = Field(None, pattern="^RUNNING|SUCCESS|ERROR|WAITING_INPUT$")
 # [/DEF:LastTask:DataClass]

 # [DEF:DatasetItem:DataClass]
+# @TIER: TRIVIAL
+# @PURPOSE: Summary DTO for a dataset in the hub listing
 class DatasetItem(BaseModel):
    id: int
    table_name: str
-    schema: str
+    schema_name: str = Field(..., alias="schema")
    database: str
    mapped_fields: Optional[MappedFields] = None
    last_task: Optional[LastTask] = None
+
+    class Config:
+        allow_population_by_field_name = True
 # [/DEF:DatasetItem:DataClass]

 # [DEF:LinkedDashboard:DataClass]
+# @TIER: TRIVIAL
+# @PURPOSE: DTO for a dashboard linked to a dataset
 class LinkedDashboard(BaseModel):
    id: int
    title: str
@@ -51,6 +62,8 @@ class LinkedDashboard(BaseModel):
 # [/DEF:LinkedDashboard:DataClass]

 # [DEF:DatasetColumn:DataClass]
+# @TIER: TRIVIAL
+# @PURPOSE: DTO for a single dataset column's metadata
 class DatasetColumn(BaseModel):
    id: int
    name: str
@@ -61,10 +74,12 @@ class DatasetColumn(BaseModel):
 # [/DEF:DatasetColumn:DataClass]

 # [DEF:DatasetDetailResponse:DataClass]
+# @TIER: TRIVIAL
+# @PURPOSE: Detailed DTO for a dataset including columns and links
 class DatasetDetailResponse(BaseModel):
    id: int
    table_name: Optional[str] = None
-    schema: Optional[str] = None
+    schema_name: Optional[str] = Field(None, alias="schema")
    database: str
    description: Optional[str] = None
    columns: List[DatasetColumn]
@@ -75,9 +90,14 @@ class DatasetDetailResponse(BaseModel):
    is_sqllab_view: bool = False
    created_on: Optional[str] = None
    changed_on: Optional[str] = None
+
+    class Config:
+        allow_population_by_field_name = True
 # [/DEF:DatasetDetailResponse:DataClass]

 # [DEF:DatasetsResponse:DataClass]
+# @TIER: TRIVIAL
+# @PURPOSE: Paginated response DTO for dataset listings
 class DatasetsResponse(BaseModel):
    datasets: List[DatasetItem]
    total: int
@@ -87,18 +107,21 @@ class DatasetsResponse(BaseModel):
 # [/DEF:DatasetsResponse:DataClass]

 # [DEF:TaskResponse:DataClass]
+# @TIER: TRIVIAL
+# @PURPOSE: Response DTO containing a task ID for tracking
 class TaskResponse(BaseModel):
    task_id: str
 # [/DEF:TaskResponse:DataClass]

 # [DEF:get_dataset_ids:Function]
+# @TIER: STANDARD
 # @PURPOSE: Fetch list of all dataset IDs from a specific environment (without pagination)
 # @PRE: env_id must be a valid environment ID
 # @POST: Returns a list of all dataset IDs
 # @PARAM: env_id (str) - The environment ID to fetch datasets from
 # @PARAM: search (Optional[str]) - Filter by table name
 # @RETURN: List[int] - List of dataset IDs
-# @RELATION: CALLS -> ResourceService.get_datasets_with_status
+# @RELATION: CALLS ->[backend.src.services.resource_service.ResourceService:get_datasets_with_status]
@router.get("/ids")
 async def get_dataset_ids(
    env_id: str,
@@ -143,6 +166,7 @@ async def get_dataset_ids(
 # [/DEF:get_dataset_ids:Function]

 # [DEF:get_datasets:Function]
+# @TIER: STANDARD
 # @PURPOSE: Fetch list of datasets from a specific environment with mapping progress
 # @PRE: env_id must be a valid environment ID
 # @PRE: page must be >= 1 if provided
@@ -154,7 +178,7 @@ async def get_dataset_ids(
 # @PARAM: page (Optional[int]) - Page number (default: 1)
 # @PARAM: page_size (Optional[int]) - Items per page (default: 10, max: 100)
 # @RETURN: DatasetsResponse - List of datasets with status metadata
-# @RELATION: CALLS -> ResourceService.get_datasets_with_status
+# @RELATION: CALLS ->[backend.src.services.resource_service.ResourceService:get_datasets_with_status]
@router.get("", response_model=DatasetsResponse)
 async def get_datasets(
    env_id: str,
@@ -222,6 +246,8 @@ async def get_datasets(
 # [/DEF:get_datasets:Function]

 # [DEF:MapColumnsRequest:DataClass]
+# @TIER: TRIVIAL
+# @PURPOSE: Request DTO for initiating column mapping
 class MapColumnsRequest(BaseModel):
    env_id: str = Field(..., description="Environment ID")
    dataset_ids: List[int] = Field(..., description="List of dataset IDs to map")
@@ -231,6 +257,7 @@ class MapColumnsRequest(BaseModel):
 # [/DEF:MapColumnsRequest:DataClass]

 # [DEF:map_columns:Function]
+# @TIER: STANDARD
 # @PURPOSE: Trigger bulk column mapping for datasets
 # @PRE: User has permission plugin:mapper:execute
 # @PRE: env_id is a valid environment ID
@@ -239,8 +266,8 @@ class MapColumnsRequest(BaseModel):
 # @POST: Task is created and queued for execution
 # @PARAM: request (MapColumnsRequest) - Mapping request with environment and dataset IDs
 # @RETURN: TaskResponse - Task ID for tracking
-# @RELATION: DISPATCHES -> MapperPlugin
-# @RELATION: CALLS -> task_manager.create_task
+# @RELATION: DISPATCHES ->[backend.src.plugins.mapper.MapperPlugin]
+# @RELATION: CALLS ->[backend.src.core.task_manager.manager.TaskManager:create_task]
@router.post("/map-columns", response_model=TaskResponse)
 async def map_columns(
    request: MapColumnsRequest,
@@ -292,6 +319,8 @@ async def map_columns(
 # [/DEF:map_columns:Function]

 # [DEF:GenerateDocsRequest:DataClass]
+# @TIER: TRIVIAL
+# @PURPOSE: Request DTO for initiating documentation generation
 class GenerateDocsRequest(BaseModel):
    env_id: str = Field(..., description="Environment ID")
    dataset_ids: List[int] = Field(..., description="List of dataset IDs to generate docs for")
@@ -300,6 +329,7 @@ class GenerateDocsRequest(BaseModel):
 # [/DEF:GenerateDocsRequest:DataClass]

 # [DEF:generate_docs:Function]
+# @TIER: STANDARD
 # @PURPOSE: Trigger bulk documentation generation for datasets
 # @PRE: User has permission plugin:llm_analysis:execute
 # @PRE: env_id is a valid environment ID
@@ -308,8 +338,8 @@ class GenerateDocsRequest(BaseModel):
 # @POST: Task is created and queued for execution
 # @PARAM: request (GenerateDocsRequest) - Documentation generation request
 # @RETURN: TaskResponse - Task ID for tracking
-# @RELATION: DISPATCHES -> LLMAnalysisPlugin
-# @RELATION: CALLS -> task_manager.create_task
+# @RELATION: DISPATCHES ->[backend.src.plugins.llm_analysis.plugin.DocumentationPlugin]
+# @RELATION: CALLS ->[backend.src.core.task_manager.manager.TaskManager:create_task]
@router.post("/generate-docs", response_model=TaskResponse)
 async def generate_docs(
    request: GenerateDocsRequest,
@@ -355,6 +385,7 @@ async def generate_docs(
 # [/DEF:generate_docs:Function]

 # [DEF:get_dataset_detail:Function]
+# @TIER: STANDARD
 # @PURPOSE: Get detailed dataset information including columns and linked dashboards
 # @PRE: env_id is a valid environment ID
 # @PRE: dataset_id is a valid dataset ID
@@ -362,7 +393,7 @@ async def generate_docs(
 # @PARAM: env_id (str) - The environment ID
 # @PARAM: dataset_id (int) - The dataset ID
 # @RETURN: DatasetDetailResponse - Detailed dataset information
-# @RELATION: CALLS -> SupersetClient.get_dataset_detail
+# @RELATION: CALLS ->[backend.src.core.superset_client.SupersetClient:get_dataset_detail]
@router.get("/{dataset_id}", response_model=DatasetDetailResponse)
 async def get_dataset_detail(
    env_id: str,
--- a/backend/src/api/routes/git.py
+++ b/backend/src/api/routes/git.py
@@ -4,9 +4,9 @@
 # @SEMANTICS: git, routes, api, fastapi, repository, deployment
 # @PURPOSE:   Provides FastAPI endpoints for Git integration operations.
 # @LAYER:     API
-# @RELATION:  USES -> src.services.git_service.GitService
-# @RELATION:  USES -> src.api.routes.git_schemas
-# @RELATION:  USES -> src.models.git
+# @RELATION:  USES -> [backend.src.services.git_service.GitService]
+# @RELATION:  USES -> [backend.src.api.routes.git_schemas]
+# @RELATION:  USES -> [backend.src.models.git]
 #
 # @INVARIANT: All Git operations must be routed through GitService.

@@ -48,6 +48,7 @@ MAX_REPOSITORY_STATUS_BATCH = 50


 # [DEF:_build_no_repo_status_payload:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Build a consistent status payload for dashboards without initialized repositories.
 # @PRE: None.
 # @POST: Returns a stable payload compatible with frontend repository status parsing.
@@ -72,6 +73,7 @@ def _build_no_repo_status_payload() -> dict:


 # [DEF:_handle_unexpected_git_route_error:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Convert unexpected route-level exceptions to stable 500 API responses.
 # @PRE: `error` is a non-HTTPException instance.
 # @POST: Raises HTTPException(500) with route-specific context.
@@ -84,6 +86,7 @@ def _handle_unexpected_git_route_error(route_name: str, error: Exception) -> Non


 # [DEF:_resolve_repository_status:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve repository status for one dashboard with graceful NO_REPO semantics.
 # @PRE: `dashboard_id` is a valid integer.
 # @POST: Returns standard status payload or `NO_REPO` payload when repository path is absent.
@@ -110,6 +113,7 @@ def _resolve_repository_status(dashboard_id: int) -> dict:


 # [DEF:_get_git_config_or_404:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve GitServerConfig by id or raise 404.
 # @PRE: db session is available.
 # @POST: Returns GitServerConfig model.
@@ -122,6 +126,7 @@ def _get_git_config_or_404(db: Session, config_id: str) -> GitServerConfig:


 # [DEF:_find_dashboard_id_by_slug:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve dashboard numeric ID by slug in a specific environment.
 # @PRE: dashboard_slug is non-empty.
 # @POST: Returns dashboard ID or None when not found.
@@ -148,6 +153,7 @@ def _find_dashboard_id_by_slug(


 # [DEF:_resolve_dashboard_id_from_ref:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve dashboard ID from slug-or-id reference for Git routes.
 # @PRE: dashboard_ref is provided; env_id is required for slug values.
 # @POST: Returns numeric dashboard ID or raises HTTPException.
@@ -182,6 +188,7 @@ def _resolve_dashboard_id_from_ref(


 # [DEF:_find_dashboard_id_by_slug_async:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve dashboard numeric ID by slug asynchronously for hot-path Git routes.
 # @PRE: dashboard_slug is non-empty.
 # @POST: Returns dashboard ID or None when not found.
@@ -208,6 +215,7 @@ async def _find_dashboard_id_by_slug_async(


 # [DEF:_resolve_dashboard_id_from_ref_async:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve dashboard ID asynchronously from slug-or-id reference for hot Git routes.
 # @PRE: dashboard_ref is provided; env_id is required for slug values.
 # @POST: Returns numeric dashboard ID or raises HTTPException.
@@ -246,6 +254,7 @@ async def _resolve_dashboard_id_from_ref_async(


 # [DEF:_resolve_repo_key_from_ref:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve repository folder key with slug-first strategy and deterministic fallback.
 # @PRE: dashboard_id is resolved and valid.
 # @POST: Returns safe key to be used in local repository path.
@@ -278,6 +287,7 @@ def _resolve_repo_key_from_ref(


 # [DEF:_sanitize_optional_identity_value:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Normalize optional identity value into trimmed string or None.
 # @PRE: value may be None or blank.
 # @POST: Returns sanitized value suitable for git identity configuration.
@@ -291,6 +301,7 @@ def _sanitize_optional_identity_value(value: Optional[str]) -> Optional[str]:


 # [DEF:_resolve_current_user_git_identity:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve configured Git username/email from current user's profile preferences.
 # @PRE: `db` may be stubbed in tests; `current_user` may be absent for direct handler invocations.
 # @POST: Returns tuple(username, email) only when both values are configured.
@@ -332,6 +343,7 @@ def _resolve_current_user_git_identity(


 # [DEF:_apply_git_identity_from_profile:Function]
+# @TIER: STANDARD
 # @PURPOSE: Apply user-scoped Git identity to repository-local config before write/pull operations.
 # @PRE: dashboard_id is resolved; db/current_user may be missing in direct test invocation context.
 # @POST: git_service.configure_identity is called only when identity and method are available.
@@ -355,6 +367,7 @@ def _apply_git_identity_from_profile(


 # [DEF:get_git_configs:Function]
+# @TIER: STANDARD
 # @PURPOSE: List all configured Git servers.
 # @PRE: Database session `db` is available.
 # @POST: Returns a list of all GitServerConfig objects from the database.
@@ -375,6 +388,7 @@ async def get_git_configs(
 # [/DEF:get_git_configs:Function]

 # [DEF:create_git_config:Function]
+# @TIER: STANDARD
 # @PURPOSE: Register a new Git server configuration.
 # @PRE: `config` contains valid GitServerConfigCreate data.
 # @POST: A new GitServerConfig record is created in the database.
@@ -396,6 +410,7 @@ async def create_git_config(
 # [/DEF:create_git_config:Function]

 # [DEF:update_git_config:Function]
+# @TIER: STANDARD
 # @PURPOSE: Update an existing Git server configuration.
 # @PRE: `config_id` corresponds to an existing configuration.
 # @POST: The configuration record is updated in the database.
@@ -430,6 +445,7 @@ async def update_git_config(
 # [/DEF:update_git_config:Function]

 # [DEF:delete_git_config:Function]
+# @TIER: STANDARD
 # @PURPOSE: Remove a Git server configuration.
 # @PRE: `config_id` corresponds to an existing configuration.
 # @POST: The configuration record is removed from the database.
@@ -451,6 +467,7 @@ async def delete_git_config(
 # [/DEF:delete_git_config:Function]

 # [DEF:test_git_config:Function]
+# @TIER: STANDARD
 # @PURPOSE: Validate connection to a Git server using provided credentials.
 # @PRE: `config` contains provider, url, and pat.
 # @POST: Returns success if the connection is validated via GitService.
@@ -482,6 +499,7 @@ async def test_git_config(


 # [DEF:list_gitea_repositories:Function]
+# @TIER: STANDARD
 # @PURPOSE: List repositories in Gitea for a saved Gitea config.
 # @PRE: config_id exists and provider is GITEA.
 # @POST: Returns repositories visible to PAT user.
@@ -512,6 +530,7 @@ async def list_gitea_repositories(


 # [DEF:create_gitea_repository:Function]
+# @TIER: STANDARD
 # @PURPOSE: Create a repository in Gitea for a saved Gitea config.
 # @PRE: config_id exists and provider is GITEA.
 # @POST: Returns created repository payload.
@@ -548,6 +567,7 @@ async def create_gitea_repository(


 # [DEF:create_remote_repository:Function]
+# @TIER: STANDARD
 # @PURPOSE: Create repository on remote Git server using selected provider config.
 # @PRE: config_id exists and PAT has creation permissions.
 # @POST: Returns normalized remote repository payload.
@@ -608,6 +628,7 @@ async def create_remote_repository(


 # [DEF:delete_gitea_repository:Function]
+# @TIER: STANDARD
 # @PURPOSE: Delete repository in Gitea for a saved Gitea config.
 # @PRE: config_id exists and provider is GITEA.
 # @POST: Target repository is deleted on Gitea.
@@ -633,6 +654,7 @@ async def delete_gitea_repository(
 # [/DEF:delete_gitea_repository:Function]

 # [DEF:init_repository:Function]
+# @TIER: STANDARD
 # @PURPOSE: Link a dashboard to a Git repository and perform initial clone/init.
 # @PRE: `dashboard_ref` exists and `init_data` contains valid config_id and remote_url.
 # @POST: Repository is initialized on disk and a GitRepository record is saved in DB.
@@ -690,6 +712,7 @@ async def init_repository(
 # [/DEF:init_repository:Function]

 # [DEF:get_repository_binding:Function]
+# @TIER: STANDARD
 # @PURPOSE: Return repository binding with provider metadata for selected dashboard.
 # @PRE: `dashboard_ref` resolves to a valid dashboard and repository is initialized.
 # @POST: Returns dashboard repository binding and linked provider.
@@ -724,6 +747,7 @@ async def get_repository_binding(
 # [/DEF:get_repository_binding:Function]

 # [DEF:delete_repository:Function]
+# @TIER: STANDARD
 # @PURPOSE: Delete local repository workspace and DB binding for selected dashboard.
 # @PRE: `dashboard_ref` resolves to a valid dashboard.
 # @POST: Repository files and binding record are removed when present.
@@ -748,6 +772,7 @@ async def delete_repository(
 # [/DEF:delete_repository:Function]

 # [DEF:get_branches:Function]
+# @TIER: STANDARD
 # @PURPOSE: List all branches for a dashboard's repository.
 # @PRE: Repository for `dashboard_ref` is initialized.
 # @POST: Returns a list of branches from the local repository.
@@ -771,6 +796,7 @@ async def get_branches(
 # [/DEF:get_branches:Function]

 # [DEF:create_branch:Function]
+# @TIER: STANDARD
 # @PURPOSE: Create a new branch in the dashboard's repository.
 # @PRE: `dashboard_ref` repository exists and `branch_data` has name and from_branch.
 # @POST: A new branch is created in the local repository.
@@ -799,6 +825,7 @@ async def create_branch(
 # [/DEF:create_branch:Function]

 # [DEF:checkout_branch:Function]
+# @TIER: STANDARD
 # @PURPOSE: Switch the dashboard's repository to a specific branch.
 # @PRE: `dashboard_ref` repository exists and branch `checkout_data.name` exists.
 # @POST: The local repository HEAD is moved to the specified branch.
@@ -824,6 +851,7 @@ async def checkout_branch(
 # [/DEF:checkout_branch:Function]

 # [DEF:commit_changes:Function]
+# @TIER: STANDARD
 # @PURPOSE: Stage and commit changes in the dashboard's repository.
 # @PRE: `dashboard_ref` repository exists and `commit_data` has message and files.
 # @POST: Specified files are staged and a new commit is created.
@@ -852,6 +880,7 @@ async def commit_changes(
 # [/DEF:commit_changes:Function]

 # [DEF:push_changes:Function]
+# @TIER: STANDARD
 # @PURPOSE: Push local commits to the remote repository.
 # @PRE: `dashboard_ref` repository exists and has a remote configured.
 # @POST: Local commits are pushed to the remote repository.
@@ -875,6 +904,7 @@ async def push_changes(
 # [/DEF:push_changes:Function]

 # [DEF:pull_changes:Function]
+# @TIER: STANDARD
 # @PURPOSE: Pull changes from the remote repository.
 # @PRE: `dashboard_ref` repository exists and has a remote configured.
 # @POST: Remote changes are fetched and merged into the local branch.
@@ -922,6 +952,7 @@ async def pull_changes(
 # [/DEF:pull_changes:Function]

 # [DEF:get_merge_status:Function]
+# @TIER: STANDARD
 # @PURPOSE: Return unfinished-merge status for repository (web-only recovery support).
 # @PRE: `dashboard_ref` resolves to a valid dashboard repository.
 # @POST: Returns merge status payload.
@@ -944,6 +975,7 @@ async def get_merge_status(


 # [DEF:get_merge_conflicts:Function]
+# @TIER: STANDARD
 # @PURPOSE: Return conflicted files with mine/theirs previews for web conflict resolver.
 # @PRE: `dashboard_ref` resolves to a valid dashboard repository.
 # @POST: Returns conflict file list.
@@ -966,6 +998,7 @@ async def get_merge_conflicts(


 # [DEF:resolve_merge_conflicts:Function]
+# @TIER: STANDARD
 # @PURPOSE: Apply mine/theirs/manual conflict resolutions from WebUI and stage files.
 # @PRE: `dashboard_ref` resolves; request contains at least one resolution item.
 # @POST: Resolved files are staged in index.
@@ -993,6 +1026,7 @@ async def resolve_merge_conflicts(


 # [DEF:abort_merge:Function]
+# @TIER: STANDARD
 # @PURPOSE: Abort unfinished merge from WebUI flow.
 # @PRE: `dashboard_ref` resolves to repository.
 # @POST: Merge operation is aborted or reports no active merge.
@@ -1015,6 +1049,7 @@ async def abort_merge(


 # [DEF:continue_merge:Function]
+# @TIER: STANDARD
 # @PURPOSE: Finalize unfinished merge from WebUI flow.
 # @PRE: All conflicts are resolved and staged.
 # @POST: Merge commit is created.
@@ -1038,6 +1073,7 @@ async def continue_merge(


 # [DEF:sync_dashboard:Function]
+# @TIER: STANDARD
 # @PURPOSE: Sync dashboard state from Superset to Git using the GitPlugin.
 # @PRE: `dashboard_ref` is valid; GitPlugin is available.
 # @POST: Dashboard YAMLs are exported from Superset and committed to Git.
@@ -1069,6 +1105,7 @@ async def sync_dashboard(


 # [DEF:promote_dashboard:Function]
+# @TIER: STANDARD
 # @PURPOSE: Promote changes between branches via MR or direct merge.
 # @PRE: dashboard repository is initialized and Git config is valid.
 # @POST: Returns promotion result metadata.
@@ -1171,6 +1208,7 @@ async def promote_dashboard(
 # [/DEF:promote_dashboard:Function]

 # [DEF:get_environments:Function]
+# @TIER: STANDARD
 # @PURPOSE: List all deployment environments.
 # @PRE: Config manager is accessible.
 # @POST: Returns a list of DeploymentEnvironmentSchema objects.
@@ -1193,6 +1231,7 @@ async def get_environments(
 # [/DEF:get_environments:Function]

 # [DEF:deploy_dashboard:Function]
+# @TIER: STANDARD
 # @PURPOSE: Deploy dashboard from Git to a target environment.
 # @PRE: `dashboard_ref` and `deploy_data.environment_id` are valid.
 # @POST: Dashboard YAMLs are read from Git and imported into the target Superset.
@@ -1223,6 +1262,7 @@ async def deploy_dashboard(
 # [/DEF:deploy_dashboard:Function]

 # [DEF:get_history:Function]
+# @TIER: STANDARD
 # @PURPOSE: View commit history for a dashboard's repository.
 # @PRE: `dashboard_ref` repository exists.
 # @POST: Returns a list of recent commits from the repository.
@@ -1248,6 +1288,7 @@ async def get_history(
 # [/DEF:get_history:Function]

 # [DEF:get_repository_status:Function]
+# @TIER: STANDARD
 # @PURPOSE: Get current Git status for a dashboard repository.
 # @PRE: `dashboard_ref` resolves to a valid dashboard.
 # @POST: Returns repository status; if repo is not initialized, returns `NO_REPO` payload.
@@ -1272,6 +1313,7 @@ async def get_repository_status(


 # [DEF:get_repository_status_batch:Function]
+# @TIER: STANDARD
 # @PURPOSE: Get Git statuses for multiple dashboard repositories in one request.
 # @PRE: `request.dashboard_ids` is provided.
 # @POST: Returns `statuses` map where each key is dashboard ID and value is repository status payload.
@@ -1315,6 +1357,7 @@ async def get_repository_status_batch(
 # [/DEF:get_repository_status_batch:Function]

 # [DEF:get_repository_diff:Function]
+# @TIER: STANDARD
 # @PURPOSE: Get Git diff for a dashboard repository.
 # @PRE: `dashboard_ref` repository exists.
 # @POST: Returns the diff text for the specified file or all changes.
@@ -1343,6 +1386,7 @@ async def get_repository_diff(
 # [/DEF:get_repository_diff:Function]

 # [DEF:generate_commit_message:Function]
+# @TIER: STANDARD
 # @PURPOSE: Generate a suggested commit message using LLM.
 # @PRE: Repository for `dashboard_ref` is initialized.
 # @POST: Returns a suggested commit message string.
--- a/backend/src/api/routes/migration.py
+++ b/backend/src/api/routes/migration.py
@@ -3,14 +3,18 @@
 # @SEMANTICS: api, migration, dashboards, sync, dry-run
 # @PURPOSE: HTTP contract layer for migration orchestration, settings, dry-run, and mapping sync endpoints.
 # @LAYER: Infra
-# @RELATION: [DEPENDS_ON] ->[backend.src.dependencies]
-# @RELATION: [DEPENDS_ON] ->[backend.src.core.database]
-# @RELATION: [DEPENDS_ON] ->[backend.src.core.superset_client]
-# @RELATION: [DEPENDS_ON] ->[backend.src.core.migration.dry_run_orchestrator]
-# @RELATION: [DEPENDS_ON] ->[backend.src.core.mapping_service]
-# @RELATION: [DEPENDS_ON] ->[backend.src.models.dashboard]
-# @RELATION: [DEPENDS_ON] ->[backend.src.models.mapping]
+# @RELATION: DEPENDS_ON ->[backend.src.dependencies]
+# @RELATION: DEPENDS_ON ->[backend.src.core.database]
+# @RELATION: DEPENDS_ON ->[backend.src.core.superset_client.SupersetClient]
+# @RELATION: DEPENDS_ON ->[backend.src.core.migration.dry_run_orchestrator.MigrationDryRunService]
+# @RELATION: DEPENDS_ON ->[backend.src.core.mapping_service.IdMappingService]
+# @RELATION: DEPENDS_ON ->[backend.src.models.dashboard]
+# @RELATION: DEPENDS_ON ->[backend.src.models.mapping]
 # @INVARIANT: Migration endpoints never execute with invalid environment references and always return explicit HTTP errors on guard failures.
+# @PRE: Backend core services initialized and Database session available.
+# @POST: Migration tasks are enqueued or dry-run results are computed and returned.
+# @SIDE_EFFECT: Enqueues long-running tasks, potentially mutates ResourceMapping table, and performs remote Superset API calls.
+# @DATA_CONTRACT: [DashboardSelection | QueryParams] -> [TaskResponse | DryRunResult | MappingSummary]
 # @TEST_CONTRACT: [DashboardSelection + configured envs] -> [task_id | dry-run result | sync summary]
 # @TEST_SCENARIO: [invalid_environment] -> [HTTP_400_or_404]
 # @TEST_SCENARIO: [valid_execution] -> [success_payload_with_required_fields]
@@ -34,6 +38,7 @@ from ...models.mapping import ResourceMapping
 router = APIRouter(prefix="/api", tags=["migration"])

 # [DEF:get_dashboards:Function]
+# @TIER: STANDARD
 # @PURPOSE: Fetch dashboard metadata from a requested environment for migration selection UI.
 # @PRE: env_id is provided and exists in configured environments.
 # @POST: Returns List[DashboardMetadata] for the resolved environment; emits HTTP_404 when environment is absent.
@@ -61,6 +66,7 @@ async def get_dashboards(
 # [/DEF:get_dashboards:Function]

 # [DEF:execute_migration:Function]
+# @TIER: CRITICAL
 # @PURPOSE: Validate migration selection and enqueue asynchronous migration task execution.
 # @PRE: DashboardSelection payload is valid and both source/target environments exist.
 # @POST: Returns {"task_id": str, "message": str} when task creation succeeds; emits HTTP_400/HTTP_500 on failure.
@@ -102,6 +108,7 @@ async def execute_migration(


 # [DEF:dry_run_migration:Function]
+# @TIER: CRITICAL
 # @PURPOSE: Build pre-flight migration diff and risk summary without mutating target systems.
 # @PRE: DashboardSelection is valid, source and target environments exist, differ, and selected_ids is non-empty.
 # @POST: Returns deterministic dry-run payload; emits HTTP_400 for guard violations and HTTP_500 for orchestrator value errors.
@@ -153,6 +160,7 @@ async def dry_run_migration(
 # [/DEF:dry_run_migration:Function]

 # [DEF:get_migration_settings:Function]
+# @TIER: STANDARD
 # @PURPOSE: Read and return configured migration synchronization cron expression.
 # @PRE: Configuration store is available and requester has READ permission.
 # @POST: Returns {"cron": str} reflecting current persisted settings value.
@@ -170,6 +178,7 @@ async def get_migration_settings(
 # [/DEF:get_migration_settings:Function]

 # [DEF:update_migration_settings:Function]
+# @TIER: STANDARD
 # @PURPOSE: Validate and persist migration synchronization cron expression update.
 # @PRE: Payload includes "cron" key and requester has WRITE permission.
 # @POST: Returns {"cron": str, "status": "updated"} and persists updated cron value.
@@ -195,6 +204,7 @@ async def update_migration_settings(
 # [/DEF:update_migration_settings:Function]

 # [DEF:get_resource_mappings:Function]
+# @TIER: STANDARD
 # @PURPOSE: Fetch synchronized resource mappings with optional filters and pagination for migration mappings view.
 # @PRE: skip>=0, 1<=limit<=500, DB session is active, requester has READ permission.
 # @POST: Returns {"items": [...], "total": int} where items reflect applied filters and pagination.
@@ -245,6 +255,7 @@ async def get_resource_mappings(
 # [/DEF:get_resource_mappings:Function]

 # [DEF:trigger_sync_now:Function]
+# @TIER: STANDARD
 # @PURPOSE: Trigger immediate ID synchronization for every configured environment.
 # @PRE: At least one environment is configured and requester has EXECUTE permission.
 # @POST: Returns sync summary with synced/failed counts after attempting all environments.
--- a/backend/src/api/routes/reports.py
+++ b/backend/src/api/routes/reports.py
@@ -3,9 +3,13 @@
 # @SEMANTICS: api, reports, list, detail, pagination, filters
 # @PURPOSE: FastAPI router for unified task report list and detail retrieval endpoints.
 # @LAYER: UI (API)
-# @RELATION: DEPENDS_ON -> backend.src.services.reports.report_service.ReportsService
-# @RELATION: DEPENDS_ON -> backend.src.dependencies
+# @RELATION: DEPENDS_ON -> [backend.src.services.reports.report_service.ReportsService]
+# @RELATION: DEPENDS_ON -> [backend.src.dependencies]
 # @INVARIANT: Endpoints are read-only and do not trigger long-running tasks.
+# @PRE: Reports service and dependencies are initialized.
+# @POST: Router is configured and endpoints are ready for registration.
+# @SIDE_EFFECT: None
+# @DATA_CONTRACT: [ReportQuery] -> [ReportCollection | ReportDetailView]

 # [SECTION: IMPORTS]
 from datetime import datetime
@@ -25,6 +29,7 @@ router = APIRouter(prefix="/api/reports", tags=["Reports"])


 # [DEF:_parse_csv_enum_list:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Parse comma-separated query value into enum list.
 # @PRE: raw may be None/empty or comma-separated values.
 # @POST: Returns enum list or raises HTTP 400 with deterministic machine-readable payload.
@@ -59,6 +64,7 @@ def _parse_csv_enum_list(raw: Optional[str], enum_cls, field_name: str) -> List:


 # [DEF:list_reports:Function]
+# @TIER: STANDARD
 # @PURPOSE: Return paginated unified reports list.
 # @PRE: authenticated/authorized request and validated query params.
 # @POST: returns {items,total,page,page_size,has_next,applied_filters}.
@@ -125,6 +131,7 @@ async def list_reports(


 # [DEF:get_report_detail:Function]
+# @TIER: STANDARD
 # @PURPOSE: Return one normalized report detail with diagnostics and next actions.
 # @PRE: authenticated/authorized request and existing report_id.
 # @POST: returns normalized detail envelope or 404 when report is not found.
--- a/backend/src/api/routes/settings.py
+++ b/backend/src/api/routes/settings.py
@@ -1,10 +1,11 @@
 # [DEF:SettingsRouter:Module]
 #
+# @TIER: STANDARD
 # @SEMANTICS: settings, api, router, fastapi
 # @PURPOSE:   Provides API endpoints for managing application settings and Superset environments.
 # @LAYER:     UI (API)
-# @RELATION:  DEPENDS_ON -> ConfigManager
-# @RELATION:  DEPENDS_ON -> ConfigModels
+# @RELATION:  DEPENDS_ON -> [backend.src.core.config_manager.ConfigManager]
+# @RELATION:  DEPENDS_ON -> [backend.src.core.config_models]
 #
 # @INVARIANT: All settings changes must be persisted via ConfigManager.
 # @PUBLIC_API: router
@@ -28,6 +29,7 @@ from sqlalchemy.orm import Session
 # [/SECTION]

 # [DEF:LoggingConfigResponse:Class]
+# @TIER: TRIVIAL
 # @PURPOSE: Response model for logging configuration with current task log level.
 # @SEMANTICS: logging, config, response
 class LoggingConfigResponse(BaseModel):
@@ -40,6 +42,7 @@ router = APIRouter()


 # [DEF:_normalize_superset_env_url:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Canonicalize Superset environment URL to base host/path without trailing /api/v1.
 # @PRE: raw_url can be empty.
 # @POST: Returns normalized base URL.
@@ -52,6 +55,7 @@ def _normalize_superset_env_url(raw_url: str) -> str:


 # [DEF:_validate_superset_connection_fast:Function]
+# @TIER: STANDARD
 # @PURPOSE: Run lightweight Superset connectivity validation without full pagination scan.
 # @PRE: env contains valid URL and credentials.
 # @POST: Raises on auth/API failures; returns None on success.
@@ -70,6 +74,7 @@ def _validate_superset_connection_fast(env: Environment) -> None:
 # [/DEF:_validate_superset_connection_fast:Function]

 # [DEF:get_settings:Function]
+# @TIER: STANDARD
 # @PURPOSE: Retrieves all application settings.
 # @PRE:     Config manager is available.
 # @POST:    Returns masked AppConfig.
@@ -91,6 +96,7 @@ async def get_settings(
 # [/DEF:get_settings:Function]

 # [DEF:update_global_settings:Function]
+# @TIER: STANDARD
 # @PURPOSE: Updates global application settings.
 # @PRE:     New settings are provided.
 # @POST:    Global settings are updated.
@@ -110,6 +116,7 @@ async def update_global_settings(
 # [/DEF:update_global_settings:Function]

 # [DEF:get_storage_settings:Function]
+# @TIER: STANDARD
 # @PURPOSE: Retrieves storage-specific settings.
 # @RETURN: StorageConfig - The storage configuration.
@router.get("/storage", response_model=StorageConfig)
@@ -122,6 +129,7 @@ async def get_storage_settings(
 # [/DEF:get_storage_settings:Function]

 # [DEF:update_storage_settings:Function]
+# @TIER: STANDARD
 # @PURPOSE: Updates storage-specific settings.
 # @PARAM: storage (StorageConfig) - The new storage settings.
 # @POST: Storage settings are updated and saved.
@@ -144,6 +152,7 @@ async def update_storage_settings(
 # [/DEF:update_storage_settings:Function]

 # [DEF:get_environments:Function]
+# @TIER: STANDARD
 # @PURPOSE: Lists all configured Superset environments.
 # @PRE:     Config manager is available.
 # @POST:    Returns list of environments.
@@ -163,6 +172,7 @@ async def get_environments(
 # [/DEF:get_environments:Function]

 # [DEF:add_environment:Function]
+# @TIER: STANDARD
 # @PURPOSE: Adds a new Superset environment.
 # @PRE:     Environment data is valid and reachable.
 # @POST:    Environment is added to config.
@@ -190,6 +200,7 @@ async def add_environment(
 # [/DEF:add_environment:Function]

 # [DEF:update_environment:Function]
+# @TIER: STANDARD
 # @PURPOSE: Updates an existing Superset environment.
 # @PRE:     ID and valid environment data are provided.
 # @POST:    Environment is updated in config.
@@ -227,6 +238,7 @@ async def update_environment(
 # [/DEF:update_environment:Function]

 # [DEF:delete_environment:Function]
+# @TIER: STANDARD
 # @PURPOSE: Deletes a Superset environment.
 # @PRE:     ID is provided.
 # @POST:    Environment is removed from config.
@@ -243,6 +255,7 @@ async def delete_environment(
 # [/DEF:delete_environment:Function]

 # [DEF:test_environment_connection:Function]
+# @TIER: STANDARD
 # @PURPOSE: Tests the connection to a Superset environment.
 # @PRE:     ID is provided.
 # @POST:    Returns success or error status.
@@ -272,6 +285,7 @@ async def test_environment_connection(
 # [/DEF:test_environment_connection:Function]

 # [DEF:get_logging_config:Function]
+# @TIER: STANDARD
 # @PURPOSE: Retrieves current logging configuration.
 # @PRE:     Config manager is available.
 # @POST:    Returns logging configuration.
@@ -291,6 +305,7 @@ async def get_logging_config(
 # [/DEF:get_logging_config:Function]

 # [DEF:update_logging_config:Function]
+# @TIER: STANDARD
 # @PURPOSE: Updates logging configuration.
 # @PRE:     New logging config is provided.
 # @POST:    Logging configuration is updated and saved.
@@ -318,6 +333,8 @@ async def update_logging_config(
 # [/DEF:update_logging_config:Function]

 # [DEF:ConsolidatedSettingsResponse:Class]
+# @TIER: TRIVIAL
+# @PURPOSE: Response model for consolidated application settings.
 class ConsolidatedSettingsResponse(BaseModel):
    environments: List[dict]
    connections: List[dict]
@@ -329,6 +346,7 @@ class ConsolidatedSettingsResponse(BaseModel):
 # [/DEF:ConsolidatedSettingsResponse:Class]

 # [DEF:get_consolidated_settings:Function]
+# @TIER: STANDARD
 # @PURPOSE: Retrieves all settings categories in a single call
 # @PRE:     Config manager is available.
 # @POST:    Returns all consolidated settings.
@@ -382,6 +400,7 @@ async def get_consolidated_settings(
 # [/DEF:get_consolidated_settings:Function]

 # [DEF:update_consolidated_settings:Function]
+# @TIER: STANDARD
 # @PURPOSE: Bulk update application settings from the consolidated view.
 # @PRE:     User has admin permissions, config is valid.
 # @POST:    Settings are updated and saved via ConfigManager.
@@ -427,6 +446,7 @@ async def update_consolidated_settings(
 # [/DEF:update_consolidated_settings:Function]

 # [DEF:get_validation_policies:Function]
+# @TIER: STANDARD
 # @PURPOSE: Lists all validation policies.
 # @RETURN: List[ValidationPolicyResponse] - List of policies.
@router.get("/automation/policies", response_model=List[ValidationPolicyResponse])
@@ -439,6 +459,7 @@ async def get_validation_policies(
 # [/DEF:get_validation_policies:Function]

 # [DEF:create_validation_policy:Function]
+# @TIER: STANDARD
 # @PURPOSE: Creates a new validation policy.
 # @PARAM: policy (ValidationPolicyCreate) - The policy data.
 # @RETURN: ValidationPolicyResponse - The created policy.
@@ -457,6 +478,7 @@ async def create_validation_policy(
 # [/DEF:create_validation_policy:Function]

 # [DEF:update_validation_policy:Function]
+# @TIER: STANDARD
 # @PURPOSE: Updates an existing validation policy.
 # @PARAM: id (str) - The ID of the policy to update.
 # @PARAM: policy (ValidationPolicyUpdate) - The updated policy data.
@@ -483,6 +505,7 @@ async def update_validation_policy(
 # [/DEF:update_validation_policy:Function]

 # [DEF:delete_validation_policy:Function]
+# @TIER: STANDARD
 # @PURPOSE: Deletes a validation policy.
 # @PARAM: id (str) - The ID of the policy to delete.
@router.delete("/automation/policies/{id}")
--- a/backend/src/api/routes/storage.py
+++ b/backend/src/api/routes/storage.py
@@ -4,7 +4,7 @@
 # @SEMANTICS: storage, files, upload, download, backup, repository
 # @PURPOSE:   API endpoints for file storage management (backups and repositories).
 # @LAYER:     API
-# @RELATION:  DEPENDS_ON -> backend.src.models.storage
+# @RELATION:  DEPENDS_ON -> [backend.src.models.storage]
 #
 # @INVARIANT: All paths must be validated against path traversal.

@@ -22,6 +22,7 @@ from ...core.logger import belief_scope
 router = APIRouter(tags=["storage"])

 # [DEF:list_files:Function]
+# @TIER: STANDARD
 # @PURPOSE:     List all files and directories in the storage system.
 #
 # @PRE:         None.
@@ -31,7 +32,7 @@ router = APIRouter(tags=["storage"])
 # @PARAM:       path (Optional[str]) - Subpath within the category.
 # @RETURN:      List[StoredFile] - List of files/directories.
 #
-# @RELATION:    CALLS -> StoragePlugin.list_files
+# @RELATION:    CALLS -> [backend.src.plugins.storage.plugin.StoragePlugin.list_files]
@router.get("/files", response_model=List[StoredFile])
 async def list_files(
    category: Optional[FileCategory] = None,
@@ -48,6 +49,7 @@ async def list_files(
 # [/DEF:list_files:Function]

 # [DEF:upload_file:Function]
+# @TIER: STANDARD
 # @PURPOSE:     Upload a file to the storage system.
 #
 # @PRE:         category must be a valid FileCategory.
@@ -61,7 +63,7 @@ async def list_files(
 #
 # @SIDE_EFFECT: Writes file to the filesystem.
 #
-# @RELATION:    CALLS -> StoragePlugin.save_file
+# @RELATION:    CALLS -> [backend.src.plugins.storage.plugin.StoragePlugin.save_file]
@router.post("/upload", response_model=StoredFile, status_code=201)
 async def upload_file(
    category: FileCategory = Form(...),
@@ -81,6 +83,7 @@ async def upload_file(
 # [/DEF:upload_file:Function]

 # [DEF:delete_file:Function]
+# @TIER: STANDARD
 # @PURPOSE:     Delete a specific file or directory.
 #
 # @PRE:         category must be a valid FileCategory.
@@ -92,7 +95,7 @@ async def upload_file(
 #
 # @SIDE_EFFECT: Deletes item from the filesystem.
 #
-# @RELATION:    CALLS -> StoragePlugin.delete_file
+# @RELATION:    CALLS -> [backend.src.plugins.storage.plugin.StoragePlugin.delete_file]
@router.delete("/files/{category}/{path:path}", status_code=204)
 async def delete_file(
    category: FileCategory,
@@ -113,6 +116,7 @@ async def delete_file(
 # [/DEF:delete_file:Function]

 # [DEF:download_file:Function]
+# @TIER: STANDARD
 # @PURPOSE:     Retrieve a file for download.
 #
 # @PRE:         category must be a valid FileCategory.
@@ -122,7 +126,7 @@ async def delete_file(
 # @PARAM:       path (str) - Relative path of the file.
 # @RETURN:      FileResponse - The file content.
 #
-# @RELATION:    CALLS -> StoragePlugin.get_file_path
+# @RELATION:    CALLS -> [backend.src.plugins.storage.plugin.StoragePlugin.get_file_path]
@router.get("/download/{category}/{path:path}")
 async def download_file(
    category: FileCategory,
@@ -145,6 +149,7 @@ async def download_file(
 # [/DEF:download_file:Function]

 # [DEF:get_file_by_path:Function]
+# @TIER: STANDARD
 # @PURPOSE: Retrieve a file by validated absolute/relative path under storage root.
 #
 # @PRE: path must resolve under configured storage root.
@@ -153,8 +158,8 @@ async def download_file(
 # @PARAM: path (str) - Absolute or storage-root-relative file path.
 # @RETURN: FileResponse - The file content.
 #
-# @RELATION:    CALLS -> StoragePlugin.get_storage_root
-# @RELATION:    CALLS -> StoragePlugin.validate_path
+# @RELATION:    CALLS -> [backend.src.plugins.storage.plugin.StoragePlugin.get_storage_root]
+# @RELATION:    CALLS -> [backend.src.plugins.storage.plugin.StoragePlugin.validate_path]
@router.get("/file")
 async def get_file_by_path(
    path: str,
--- a/backend/src/api/routes/tasks.py
+++ b/backend/src/api/routes/tasks.py
@@ -3,7 +3,11 @@
 # @SEMANTICS: api, router, tasks, create, list, get, logs
 # @PURPOSE: Defines the FastAPI router for task-related endpoints, allowing clients to create, list, and get the status of tasks.
 # @LAYER: UI (API)
-# @RELATION: Depends on the TaskManager. It is included by the main app.
+# @RELATION: DEPENDS_ON -> [backend.src.core.task_manager.manager.TaskManager]
+# @RELATION: DEPENDS_ON -> [backend.src.core.config_manager.ConfigManager]
+# @RELATION: DEPENDS_ON -> [backend.src.services.llm_provider.LLMProviderService]
+
+# [SECTION: IMPORTS]
 from typing import List, Dict, Any, Optional
 from fastapi import APIRouter, Depends, HTTPException, status, Query
 from pydantic import BaseModel
@@ -18,6 +22,7 @@ from ...services.llm_prompt_templates import (
    normalize_llm_settings,
    resolve_bound_provider_id,
 )
+# [/SECTION]

 router = APIRouter()

@@ -37,14 +42,15 @@ class ResolveTaskRequest(BaseModel):
 class ResumeTaskRequest(BaseModel):
    passwords: Dict[str, str]

-@router.post("", response_model=Task, status_code=status.HTTP_201_CREATED)
 # [DEF:create_task:Function]
+# @TIER: STANDARD
 # @PURPOSE: Create and start a new task for a given plugin.
 # @PARAM: request (CreateTaskRequest) - The request body containing plugin_id and params.
 # @PARAM: task_manager (TaskManager) - The task manager instance.
 # @PRE: plugin_id must exist and params must be valid for that plugin.
 # @POST: A new task is created and started.
 # @RETURN: Task - The created task instance.
+@router.post("", response_model=Task, status_code=status.HTTP_201_CREATED)
 async def create_task(
    request: CreateTaskRequest,
    task_manager: TaskManager = Depends(get_task_manager),
@@ -53,9 +59,6 @@ async def create_task(
 ):
    # Dynamic permission check based on plugin_id
    has_permission(f"plugin:{request.plugin_id}", "EXECUTE")(current_user)
-    """
-    Create and start a new task for a given plugin.
-    """
    with belief_scope("create_task"):
        try:
            # Special handling for LLM tasks to resolve provider config by task binding.
@@ -103,8 +106,8 @@ async def create_task(
            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=str(e))
 # [/DEF:create_task:Function]

-@router.get("", response_model=List[Task])
 # [DEF:list_tasks:Function]
+# @TIER: STANDARD
 # @PURPOSE: Retrieve a list of tasks with pagination and optional status filter.
 # @PARAM: limit (int) - Maximum number of tasks to return.
 # @PARAM: offset (int) - Number of tasks to skip.
@@ -113,6 +116,7 @@ async def create_task(
 # @PRE: task_manager must be available.
 # @POST: Returns a list of tasks.
 # @RETURN: List[Task] - List of tasks.
+@router.get("", response_model=List[Task])
 async def list_tasks(
    limit: int = 10,
    offset: int = 0,
@@ -123,9 +127,6 @@ async def list_tasks(
    task_manager: TaskManager = Depends(get_task_manager),
    _ = Depends(has_permission("tasks", "READ"))
 ):
-    """
-    Retrieve a list of tasks with pagination and optional status filter.
-    """
    with belief_scope("list_tasks"):
        plugin_filters = list(plugin_id) if plugin_id else []
        if task_type:
@@ -145,22 +146,20 @@ async def list_tasks(
        )
 # [/DEF:list_tasks:Function]

-@router.get("/{task_id}", response_model=Task)
 # [DEF:get_task:Function]
+# @TIER: STANDARD
 # @PURPOSE: Retrieve the details of a specific task.
 # @PARAM: task_id (str) - The unique identifier of the task.
 # @PARAM: task_manager (TaskManager) - The task manager instance.
 # @PRE: task_id must exist.
 # @POST: Returns task details or raises 404.
 # @RETURN: Task - The task details.
+@router.get("/{task_id}", response_model=Task)
 async def get_task(
    task_id: str,
    task_manager: TaskManager = Depends(get_task_manager),
    _ = Depends(has_permission("tasks", "READ"))
 ):
-    """
-    Retrieve the details of a specific task.
-    """
    with belief_scope("get_task"):
        task = task_manager.get_task(task_id)
        if not task:
@@ -168,8 +167,8 @@ async def get_task(
        return task
 # [/DEF:get_task:Function]

-@router.get("/{task_id}/logs", response_model=List[LogEntry])
 # [DEF:get_task_logs:Function]
+# @TIER: CRITICAL
 # @PURPOSE: Retrieve logs for a specific task with optional filtering.
 # @PARAM: task_id (str) - The unique identifier of the task.
 # @PARAM: level (Optional[str]) - Filter by log level (DEBUG, INFO, WARNING, ERROR).
@@ -181,17 +180,6 @@ async def get_task(
 # @PRE: task_id must exist.
 # @POST: Returns a list of log entries or raises 404.
 # @RETURN: List[LogEntry] - List of log entries.
-# @TIER: CRITICAL
-# @TEST_CONTRACT get_task_logs_api ->
-# {
-#   required_params: {task_id: str},
-#   optional_params: {level: str, source: str, search: str},
-#   invariants: ["returns 404 for non-existent task", "applies filters correctly"]
-# }
-# @TEST_FIXTURE valid_task_logs_request -> {"task_id": "test_1", "level": "INFO"}
-# @TEST_EDGE task_not_found -> raises 404
-# @TEST_EDGE invalid_limit -> Query(limit=0) returns 422
-# @TEST_INVARIANT response_purity -> verifies: [valid_task_logs_request]
 # @TEST_CONTRACT: TaskLogQueryInput -> List[LogEntry]
 # @TEST_SCENARIO: existing_task_logs_filtered -> Returns filtered logs by level/source/search with pagination.
 # @TEST_FIXTURE: valid_task_with_mixed_logs -> backend/tests/fixtures/task_logs/valid_task_with_mixed_logs.json
@@ -199,6 +187,7 @@ async def get_task(
 # @TEST_EDGE: invalid_level_type -> Non-string/invalid level query rejected by validation or yields empty result.
 # @TEST_EDGE: pagination_bounds -> offset=0 and limit=1000 remain within API bounds and do not overflow.
 # @TEST_INVARIANT: logs_only_for_existing_task -> VERIFIED_BY: [existing_task_logs_filtered, missing_task]
+@router.get("/{task_id}/logs", response_model=List[LogEntry])
 async def get_task_logs(
    task_id: str,
    level: Optional[str] = Query(None, description="Filter by log level (DEBUG, INFO, WARNING, ERROR)"),
@@ -209,10 +198,6 @@ async def get_task_logs(
    task_manager: TaskManager = Depends(get_task_manager),
    _ = Depends(has_permission("tasks", "READ"))
 ):
-    """
-    Retrieve logs for a specific task with optional filtering.
-    Supports filtering by level, source, and text search.
-    """
    with belief_scope("get_task_logs"):
        task = task_manager.get_task(task_id)
        if not task:
@@ -228,22 +213,20 @@ async def get_task_logs(
        return task_manager.get_task_logs(task_id, log_filter)
 # [/DEF:get_task_logs:Function]

-@router.get("/{task_id}/logs/stats", response_model=LogStats)
 # [DEF:get_task_log_stats:Function]
+# @TIER: STANDARD
 # @PURPOSE: Get statistics about logs for a task (counts by level and source).
 # @PARAM: task_id (str) - The unique identifier of the task.
 # @PARAM: task_manager (TaskManager) - The task manager instance.
 # @PRE: task_id must exist.
 # @POST: Returns log statistics or raises 404.
 # @RETURN: LogStats - Statistics about task logs.
+@router.get("/{task_id}/logs/stats", response_model=LogStats)
 async def get_task_log_stats(
    task_id: str,
    task_manager: TaskManager = Depends(get_task_manager),
    _ = Depends(has_permission("tasks", "READ"))
 ):
-    """
-    Get statistics about logs for a task (counts by level and source).
-    """
    with belief_scope("get_task_log_stats"):
        task = task_manager.get_task(task_id)
        if not task:
@@ -251,22 +234,20 @@ async def get_task_log_stats(
        return task_manager.get_task_log_stats(task_id)
 # [/DEF:get_task_log_stats:Function]

-@router.get("/{task_id}/logs/sources", response_model=List[str])
 # [DEF:get_task_log_sources:Function]
+# @TIER: STANDARD
 # @PURPOSE: Get unique sources for a task's logs.
 # @PARAM: task_id (str) - The unique identifier of the task.
 # @PARAM: task_manager (TaskManager) - The task manager instance.
 # @PRE: task_id must exist.
 # @POST: Returns list of unique source names or raises 404.
 # @RETURN: List[str] - Unique source names.
+@router.get("/{task_id}/logs/sources", response_model=List[str])
 async def get_task_log_sources(
    task_id: str,
    task_manager: TaskManager = Depends(get_task_manager),
    _ = Depends(has_permission("tasks", "READ"))
 ):
-    """
-    Get unique sources for a task's logs.
-    """
    with belief_scope("get_task_log_sources"):
        task = task_manager.get_task(task_id)
        if not task:
@@ -274,8 +255,8 @@ async def get_task_log_sources(
        return task_manager.get_task_log_sources(task_id)
 # [/DEF:get_task_log_sources:Function]

-@router.post("/{task_id}/resolve", response_model=Task)
 # [DEF:resolve_task:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resolve a task that is awaiting mapping.
 # @PARAM: task_id (str) - The unique identifier of the task.
 # @PARAM: request (ResolveTaskRequest) - The resolution parameters.
@@ -283,15 +264,13 @@ async def get_task_log_sources(
 # @PRE: task must be in AWAITING_MAPPING status.
 # @POST: Task is resolved and resumes execution.
 # @RETURN: Task - The updated task object.
+@router.post("/{task_id}/resolve", response_model=Task)
 async def resolve_task(
    task_id: str,
    request: ResolveTaskRequest,
    task_manager: TaskManager = Depends(get_task_manager),
    _ = Depends(has_permission("tasks", "WRITE"))
 ):
-    """
-    Resolve a task that is awaiting mapping.
-    """
    with belief_scope("resolve_task"):
        try:
            await task_manager.resolve_task(task_id, request.resolution_params)
@@ -300,8 +279,8 @@ async def resolve_task(
            raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))
 # [/DEF:resolve_task:Function]

-@router.post("/{task_id}/resume", response_model=Task)
 # [DEF:resume_task:Function]
+# @TIER: STANDARD
 # @PURPOSE: Resume a task that is awaiting input (e.g., passwords).
 # @PARAM: task_id (str) - The unique identifier of the task.
 # @PARAM: request (ResumeTaskRequest) - The input (passwords).
@@ -309,15 +288,13 @@ async def resolve_task(
 # @PRE: task must be in AWAITING_INPUT status.
 # @POST: Task resumes execution with provided input.
 # @RETURN: Task - The updated task object.
+@router.post("/{task_id}/resume", response_model=Task)
 async def resume_task(
    task_id: str,
    request: ResumeTaskRequest,
    task_manager: TaskManager = Depends(get_task_manager),
    _ = Depends(has_permission("tasks", "WRITE"))
 ):
-    """
-    Resume a task that is awaiting input (e.g., passwords).
-    """
    with belief_scope("resume_task"):
        try:
            task_manager.resume_task_with_password(task_id, request.passwords)
@@ -326,23 +303,22 @@ async def resume_task(
            raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))
 # [/DEF:resume_task:Function]

-@router.delete("", status_code=status.HTTP_204_NO_CONTENT)
 # [DEF:clear_tasks:Function]
+# @TIER: STANDARD
 # @PURPOSE: Clear tasks matching the status filter.
 # @PARAM: status (Optional[TaskStatus]) - Filter by task status.
 # @PARAM: task_manager (TaskManager) - The task manager instance.
 # @PRE: task_manager is available.
 # @POST: Tasks are removed from memory/persistence.
+@router.delete("", status_code=status.HTTP_204_NO_CONTENT)
 async def clear_tasks(
    status: Optional[TaskStatus] = None,
    task_manager: TaskManager = Depends(get_task_manager),
    _ = Depends(has_permission("tasks", "WRITE"))
 ):
-    """
-    Clear tasks matching the status filter. If no filter, clears all non-running tasks.
-    """
    with belief_scope("clear_tasks", f"status={status}"):
        task_manager.clear_tasks(status)
        return
 # [/DEF:clear_tasks:Function]
+
 # [/DEF:TasksRouter:Module]
--- a/backend/src/app.py
+++ b/backend/src/app.py
@@ -3,9 +3,15 @@
 # @SEMANTICS: app, main, entrypoint, fastapi
 # @PURPOSE: The main entry point for the FastAPI application. It initializes the app, configures CORS, sets up dependencies, includes API routers, and defines the WebSocket endpoint for log streaming.
 # @LAYER: UI (API)
-# @RELATION: Depends on the dependency module and API route modules.
+# @RELATION: DEPENDS_ON ->[backend.src.dependencies]
+# @RELATION: DEPENDS_ON ->[backend.src.api.routes]
 # @INVARIANT: Only one FastAPI app instance exists per process.
 # @INVARIANT: All WebSocket connections must be properly cleaned up on disconnect.
+# @PRE: Python environment and dependencies installed; configuration database available.
+# @POST: FastAPI app instance is created, middleware configured, and routes registered.
+# @SIDE_EFFECT: Starts background scheduler and binds network ports for HTTP/WS traffic.
+# @DATA_CONTRACT: [HTTP Request | WS Message] -> [HTTP Response | JSON Log Stream]
+
 from pathlib import Path

 # project_root is used for static files mounting
@@ -26,6 +32,7 @@ from .api.routes import plugins, tasks, settings, environments, mappings, migrat
 from .api import auth

 # [DEF:App:Global]
+# @TIER: TRIVIAL
 # @SEMANTICS: app, fastapi, instance
 # @PURPOSE: The global FastAPI application instance.
 app = FastAPI(
@@ -36,6 +43,7 @@ app = FastAPI(
 # [/DEF:App:Global]

 # [DEF:startup_event:Function]
+# @TIER: STANDARD
 # @PURPOSE: Handles application startup tasks, such as starting the scheduler.
 # @PRE: None.
 # @POST: Scheduler is started.
@@ -49,6 +57,7 @@ async def startup_event():
 # [/DEF:startup_event:Function]

 # [DEF:shutdown_event:Function]
+# @TIER: STANDARD
 # @PURPOSE: Handles application shutdown tasks, such as stopping the scheduler.
 # @PRE: None.
 # @POST: Scheduler is stopped.
@@ -57,7 +66,7 @@ async def startup_event():
 async def shutdown_event():
    with belief_scope("shutdown_event"):
        scheduler = get_scheduler_service()
-    scheduler.stop()
+        scheduler.stop()
 # [/DEF:shutdown_event:Function]

 # Configure Session Middleware (required by Authlib for OAuth2 flow)
@@ -75,6 +84,7 @@ app.add_middleware(


 # [DEF:network_error_handler:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Global exception handler for NetworkError.
 # @PRE: request is a FastAPI Request object.
 # @POST: Returns 503 HTTP Exception.
@@ -91,6 +101,7 @@ async def network_error_handler(request: Request, exc: NetworkError):
 # [/DEF:network_error_handler:Function]

 # [DEF:log_requests:Function]
+# @TIER: STANDARD
 # @PURPOSE: Middleware to log incoming HTTP requests and their response status.
 # @PRE: request is a FastAPI Request object.
 # @POST: Logs request and response details.
@@ -142,16 +153,19 @@ app.include_router(health.router)


 # [DEF:api.include_routers:Action]
+# @TIER: TRIVIAL
 # @PURPOSE: Registers all API routers with the FastAPI application.
 # @LAYER: API
 # @SEMANTICS: routes, registration, api
 # [/DEF:api.include_routers:Action]

 # [DEF:websocket_endpoint:Function]
+# @TIER: CRITICAL
 # @PURPOSE: Provides a WebSocket endpoint for real-time log streaming of a task with server-side filtering.
 # @PRE: task_id must be a valid task ID.
 # @POST: WebSocket connection is managed and logs are streamed until disconnect.
-# @TIER: CRITICAL
+# @SIDE_EFFECT: Subscribes to TaskManager log queue and broadcasts messages over network.
+# @DATA_CONTRACT: [task_id: str, source: str, level: str] -> [JSON log entry objects]
 # @UX_STATE: Connecting -> Streaming -> (Disconnected)
 #
 # @TEST_CONTRACT: WebSocketLogStreamApi ->
@@ -266,6 +280,7 @@ async def websocket_endpoint(
 # [/DEF:websocket_endpoint:Function]

 # [DEF:StaticFiles:Mount]
+# @TIER: TRIVIAL
 # @SEMANTICS: static, frontend, spa
 # @PURPOSE: Mounts the frontend build directory to serve static assets.
 frontend_path = project_root / "frontend" / "build"
@@ -273,6 +288,7 @@ if frontend_path.exists():
    app.mount("/_app", StaticFiles(directory=str(frontend_path / "_app")), name="static")

    # [DEF:serve_spa:Function]
+    # @TIER: TRIVIAL
    # @PURPOSE: Serves the SPA frontend for any path not matched by API routes.
    # @PRE: frontend_path exists.
    # @POST: Returns the requested file or index.html.
@@ -293,6 +309,7 @@ if frontend_path.exists():
    # [/DEF:serve_spa:Function]
 else:
    # [DEF:read_root:Function]
+    # @TIER: TRIVIAL
    # @PURPOSE: A simple root endpoint to confirm that the API is running when frontend is missing.
    # @PRE: None.
    # @POST: Returns a JSON message indicating API status.
--- a/backend/src/core/async_superset_client.py
+++ b/backend/src/core/async_superset_client.py
@@ -4,8 +4,12 @@
 # @SEMANTICS: superset, async, client, httpx, dashboards, datasets
 # @PURPOSE: Async Superset client for dashboard hot-path requests without blocking FastAPI event loop.
 # @LAYER: Core
-# @RELATION: DEPENDS_ON -> backend.src.core.superset_client
-# @RELATION: DEPENDS_ON -> backend.src.core.utils.async_network.AsyncAPIClient
+# @PRE: Environment configuration is valid and Superset endpoint is reachable.
+# @POST: Provides non-blocking API access to Superset resources.
+# @SIDE_EFFECT: Performs network I/O via httpx.
+# @DATA_CONTRACT: Input[Environment] -> Model[dashboard, chart, dataset]
+# @RELATION: [DEPENDS_ON] ->[backend.src.core.superset_client]
+# @RELATION: [DEPENDS_ON] ->[backend.src.core.utils.async_network.AsyncAPIClient]
 # @INVARIANT: Async dashboard operations reuse shared auth cache and avoid sync requests in async routes.

 # [SECTION: IMPORTS]
@@ -22,9 +26,11 @@ from .utils.async_network import AsyncAPIClient


 # [DEF:AsyncSupersetClient:Class]
+# @TIER: STANDARD
 # @PURPOSE: Async sibling of SupersetClient for dashboard read paths.
 class AsyncSupersetClient(SupersetClient):
    # [DEF:__init__:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Initialize async Superset client with AsyncAPIClient transport.
    # @PRE: env is valid.
    # @POST: Client uses async network transport and inherited projection helpers.
@@ -45,6 +51,7 @@ class AsyncSupersetClient(SupersetClient):
    # [/DEF:__init__:Function]

    # [DEF:aclose:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Close async transport resources.
    # @POST: Underlying AsyncAPIClient is closed.
    async def aclose(self) -> None:
@@ -52,6 +59,7 @@ class AsyncSupersetClient(SupersetClient):
    # [/DEF:aclose:Function]

    # [DEF:get_dashboards_page_async:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Fetch one dashboards page asynchronously.
    # @POST: Returns total count and page result list.
    async def get_dashboards_page_async(self, query: Optional[Dict] = None) -> Tuple[int, List[Dict]]:
@@ -85,6 +93,7 @@ class AsyncSupersetClient(SupersetClient):
    # [/DEF:get_dashboards_page_async:Function]

    # [DEF:get_dashboard_async:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Fetch one dashboard payload asynchronously.
    # @POST: Returns raw dashboard payload from Superset API.
    async def get_dashboard_async(self, dashboard_id: int) -> Dict:
@@ -94,6 +103,7 @@ class AsyncSupersetClient(SupersetClient):
    # [/DEF:get_dashboard_async:Function]

    # [DEF:get_chart_async:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Fetch one chart payload asynchronously.
    # @POST: Returns raw chart payload from Superset API.
    async def get_chart_async(self, chart_id: int) -> Dict:
@@ -103,6 +113,7 @@ class AsyncSupersetClient(SupersetClient):
    # [/DEF:get_chart_async:Function]

    # [DEF:get_dashboard_detail_async:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Fetch dashboard detail asynchronously with concurrent charts/datasets requests.
    # @POST: Returns dashboard detail payload for overview page.
    async def get_dashboard_detail_async(self, dashboard_id: int) -> Dict:
--- a/backend/src/core/auth/repository.py
+++ b/backend/src/core/auth/repository.py
@@ -4,6 +4,10 @@
 # @SEMANTICS: auth, repository, database, user, role, permission
 # @PURPOSE:   Data access layer for authentication and user preference entities.
 # @LAYER:     Domain
+# @PRE:       SQLAlchemy session manager and auth models are available.
+# @POST:      Provides transactional access to Auth-related database entities.
+# @SIDE_EFFECT: Performs database I/O via SQLAlchemy sessions.
+# @DATA_CONTRACT: Input[Session] -> Model[User, Role, Permission, UserDashboardPreference]
 # @RELATION:  [DEPENDS_ON] ->[sqlalchemy.orm.Session]
 # @RELATION:  [DEPENDS_ON] ->[backend.src.models.auth]
 # @RELATION:  [DEPENDS_ON] ->[backend.src.models.profile]
@@ -21,10 +25,12 @@ from ..logger import belief_scope, logger
 # [/SECTION]

 # [DEF:AuthRepository:Class]
+# @TIER: CRITICAL
 # @PURPOSE: Encapsulates database operations for authentication-related entities.
 # @RELATION: [DEPENDS_ON] ->[sqlalchemy.orm.Session]
 class AuthRepository:
    # [DEF:__init__:Function]
+    # @TIER: CRITICAL
    # @PURPOSE: Bind repository instance to an existing SQLAlchemy session.
    # @PRE:     db is an initialized sqlalchemy.orm.Session instance.
    # @POST:    self.db points to the provided session and is used by all repository methods.
@@ -42,6 +48,7 @@ class AuthRepository:
    # [/DEF:__init__:Function]

    # [DEF:get_user_by_username:Function]
+    # @TIER: CRITICAL
    # @PURPOSE: Retrieve a user entity by unique username.
    # @PRE:     username is a non-empty str and self.db is a valid open Session.
    # @POST:    Returns matching User entity when present, otherwise None.
@@ -68,6 +75,7 @@ class AuthRepository:
    # [/DEF:get_user_by_username:Function]

    # [DEF:get_user_by_id:Function]
+    # @TIER: CRITICAL
    # @PURPOSE: Retrieve a user entity by identifier.
    # @PRE:     user_id is a non-empty str and self.db is a valid open Session.
    # @POST:    Returns matching User entity when present, otherwise None.
@@ -89,6 +97,7 @@ class AuthRepository:
    # [/DEF:get_user_by_id:Function]

    # [DEF:get_role_by_name:Function]
+    # @TIER: CRITICAL
    # @PURPOSE: Retrieve a role entity by role name.
    # @PRE:     name is a non-empty str and self.db is a valid open Session.
    # @POST:    Returns matching Role entity when present, otherwise None.
@@ -100,6 +109,7 @@ class AuthRepository:
    # [/DEF:get_role_by_name:Function]

    # [DEF:update_last_login:Function]
+    # @TIER: CRITICAL
    # @PURPOSE: Update last_login timestamp for the provided user entity.
    # @PRE:     user is a managed User instance and self.db is a valid open Session.
    # @POST:    user.last_login is set to current UTC timestamp and transaction is committed.
@@ -119,6 +129,7 @@ class AuthRepository:
    # [/DEF:update_last_login:Function]

    # [DEF:get_role_by_id:Function]
+    # @TIER: CRITICAL
    # @PURPOSE: Retrieve a role entity by identifier.
    # @PRE:     role_id is a non-empty str and self.db is a valid open Session.
    # @POST:    Returns matching Role entity when present, otherwise None.
@@ -130,6 +141,7 @@ class AuthRepository:
    # [/DEF:get_role_by_id:Function]

    # [DEF:get_permission_by_id:Function]
+    # @TIER: CRITICAL
    # @PURPOSE: Retrieve a permission entity by identifier.
    # @PRE:     perm_id is a non-empty str and self.db is a valid open Session.
    # @POST:    Returns matching Permission entity when present, otherwise None.
@@ -141,6 +153,7 @@ class AuthRepository:
    # [/DEF:get_permission_by_id:Function]

    # [DEF:get_permission_by_resource_action:Function]
+    # @TIER: CRITICAL
    # @PURPOSE: Retrieve a permission entity by resource and action pair.
    # @PRE:     resource and action are non-empty str values; self.db is a valid open Session.
    # @POST:    Returns matching Permission entity when present, otherwise None.
@@ -155,6 +168,7 @@ class AuthRepository:
    # [/DEF:get_permission_by_resource_action:Function]

    # [DEF:get_user_dashboard_preference:Function]
+    # @TIER: CRITICAL
    # @PURPOSE: Retrieve dashboard preference entity owned by specified user.
    # @PRE:     user_id is a non-empty str and self.db is a valid open Session.
    # @POST:    Returns matching UserDashboardPreference entity when present, otherwise None.
@@ -170,6 +184,7 @@ class AuthRepository:
    # [/DEF:get_user_dashboard_preference:Function]

    # [DEF:save_user_dashboard_preference:Function]
+    # @TIER: CRITICAL
    # @PURPOSE: Persist dashboard preference entity and return refreshed persistent row.
    # @PRE:     preference is a valid UserDashboardPreference entity and self.db is a valid open Session.
    # @POST:    preference is committed to DB, refreshed from DB state, and returned.
@@ -192,6 +207,7 @@ class AuthRepository:
    # [/DEF:save_user_dashboard_preference:Function]

    # [DEF:list_permissions:Function]
+    # @TIER: CRITICAL
    # @PURPOSE: List all permission entities available in storage.
    # @PRE:     self.db is a valid open Session.
    # @POST:    Returns list containing all Permission entities visible to the session.
--- a/backend/src/core/config_manager.py
+++ b/backend/src/core/config_manager.py
@@ -4,12 +4,15 @@
 # @SEMANTICS: config, manager, persistence, migration, postgresql
 # @PURPOSE: Manages application configuration persistence in DB with one-time migration from legacy JSON.
 # @LAYER: Domain
-# @RELATION: [DEPENDS_ON] ->[ConfigModels]
-# @RELATION: [DEPENDS_ON] ->[SessionLocal]
-# @RELATION: [DEPENDS_ON] ->[AppConfigRecord]
-# @RELATION: [CALLS] ->[logger]
-# @RELATION: [CALLS] ->[configure_logger]
-# @RELATION: [BINDS_TO] ->[ConfigManager]
+# @PRE: Database schema for AppConfigRecord must be initialized.
+# @POST: Configuration is loaded into memory and logger is configured.
+# @SIDE_EFFECT: Performs DB I/O and may update global logging level.
+# @DATA_CONTRACT: Input[json, record] -> Model[AppConfig]
+# @RELATION: [DEPENDS_ON] ->[backend.src.core.config_models.AppConfig]
+# @RELATION: [DEPENDS_ON] ->[backend.src.core.database.SessionLocal]
+# @RELATION: [DEPENDS_ON] ->[backend.src.models.config.AppConfigRecord]
+# @RELATION: [CALLS] ->[backend.src.core.logger.logger]
+# @RELATION: [CALLS] ->[backend.src.core.logger.configure_logger]
 # @INVARIANT: Configuration must always be representable by AppConfig and persisted under global record id.
 #
 import json
@@ -57,6 +60,7 @@ class ConfigManager:
    # [/DEF:__init__:Function]

    # [DEF:_default_config:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Build default application configuration fallback.
    # @PRE: None.
    # @POST: Returns valid AppConfig with empty environments and default storage settings.
@@ -71,6 +75,7 @@ class ConfigManager:
    # [/DEF:_default_config:Function]

    # [DEF:_sync_raw_payload_from_config:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Merge typed AppConfig state into raw payload while preserving unsupported legacy sections.
    # @PRE: self.config is initialized as AppConfig.
    # @POST: self.raw_payload contains AppConfig fields refreshed from self.config.
@@ -85,6 +90,7 @@ class ConfigManager:
    # [/DEF:_sync_raw_payload_from_config:Function]

    # [DEF:_load_from_legacy_file:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Load legacy JSON configuration for migration fallback path.
    # @PRE: self.config_path is initialized.
    # @POST: Returns AppConfig from file payload or safe default.
@@ -110,6 +116,7 @@ class ConfigManager:
    # [/DEF:_load_from_legacy_file:Function]

    # [DEF:_get_record:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Resolve global configuration record from DB.
    # @PRE: session is an active SQLAlchemy Session.
    # @POST: Returns record when present, otherwise None.
@@ -121,6 +128,7 @@ class ConfigManager:
    # [/DEF:_get_record:Function]

    # [DEF:_load_config:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Load configuration from DB or perform one-time migration from legacy JSON.
    # @PRE: SessionLocal factory is available and AppConfigRecord schema is accessible.
    # @POST: Returns valid AppConfig and closes opened DB session.
@@ -152,6 +160,7 @@ class ConfigManager:
    # [/DEF:_load_config:Function]

    # [DEF:_save_config_to_db:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Persist provided AppConfig into the global DB configuration record.
    # @PRE: config is AppConfig; session is either None or an active Session.
    # @POST: Global DB record payload equals config.model_dump() when commit succeeds.
@@ -186,6 +195,7 @@ class ConfigManager:
    # [/DEF:_save_config_to_db:Function]

    # [DEF:save:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Persist current in-memory configuration state.
    # @PRE: self.config is initialized.
    # @POST: Current self.config is written to DB global record.
@@ -197,6 +207,7 @@ class ConfigManager:
    # [/DEF:save:Function]

    # [DEF:get_config:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Return current in-memory configuration snapshot.
    # @PRE: self.config is initialized.
    # @POST: Returns AppConfig reference stored in manager.
@@ -208,6 +219,7 @@ class ConfigManager:
    # [/DEF:get_config:Function]

    # [DEF:get_payload:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Return full persisted payload including sections outside typed AppConfig schema.
    # @PRE: Manager state is initialized.
    # @POST: Returns dict payload with current AppConfig fields synchronized.
@@ -219,6 +231,7 @@ class ConfigManager:
    # [/DEF:get_payload:Function]

    # [DEF:save_config:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Persist configuration provided either as typed AppConfig or raw payload dict.
    # @PRE: config is AppConfig or dict compatible with AppConfig core schema.
    # @POST: self.config and self.raw_payload are synchronized and persisted to DB.
@@ -240,6 +253,7 @@ class ConfigManager:
    # [/DEF:save_config:Function]

    # [DEF:update_global_settings:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Replace global settings and persist the resulting configuration.
    # @PRE: settings is GlobalSettings.
    # @POST: self.config.settings equals provided settings and DB state is updated.
@@ -258,6 +272,7 @@ class ConfigManager:
    # [/DEF:update_global_settings:Function]

    # [DEF:validate_path:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Validate that path exists and is writable, creating it when absent.
    # @PRE: path is a string path candidate.
    # @POST: Returns (True, msg) for writable path, else (False, reason).
@@ -279,6 +294,7 @@ class ConfigManager:
    # [/DEF:validate_path:Function]

    # [DEF:get_environments:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Return all configured environments.
    # @PRE: self.config is initialized.
    # @POST: Returns list of Environment models from current configuration.
@@ -290,6 +306,7 @@ class ConfigManager:
    # [/DEF:get_environments:Function]

    # [DEF:has_environments:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Check whether at least one environment exists in configuration.
    # @PRE: self.config is initialized.
    # @POST: Returns True iff environment list length is greater than zero.
@@ -301,6 +318,7 @@ class ConfigManager:
    # [/DEF:has_environments:Function]

    # [DEF:get_environment:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Resolve a configured environment by identifier.
    # @PRE: env_id is string identifier.
    # @POST: Returns matching Environment when found; otherwise None.
@@ -315,6 +333,7 @@ class ConfigManager:
    # [/DEF:get_environment:Function]

    # [DEF:add_environment:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Upsert environment by id into configuration and persist.
    # @PRE: env is Environment.
    # @POST: Configuration contains provided env id with new payload persisted.
@@ -333,6 +352,7 @@ class ConfigManager:
    # [/DEF:add_environment:Function]

    # [DEF:update_environment:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Update existing environment by id and preserve masked password placeholder behavior.
    # @PRE: env_id is non-empty string and updated_env is Environment.
    # @POST: Returns True and persists update when target exists; else returns False.
@@ -362,6 +382,7 @@ class ConfigManager:
    # [/DEF:update_environment:Function]

    # [DEF:delete_environment:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Delete environment by id and persist when deletion occurs.
    # @PRE: env_id is non-empty string.
    # @POST: Environment is removed when present; otherwise configuration is unchanged.
--- a/backend/src/core/database.py
+++ b/backend/src/core/database.py
@@ -4,9 +4,9 @@
 # @SEMANTICS: database, postgresql, sqlalchemy, session, persistence
 # @PURPOSE:   Configures database connection and session management (PostgreSQL-first).
 # @LAYER:     Core
-# @RELATION:  DEPENDS_ON -> sqlalchemy
-# @RELATION:  DEPENDS_ON -> backend.src.models.mapping
-# @RELATION:  DEPENDS_ON -> backend.src.core.auth.config
+# @RELATION:  DEPENDS_ON ->[sqlalchemy]
+# @RELATION:  DEPENDS_ON ->[backend.src.models.mapping]
+# @RELATION:  DEPENDS_ON ->[backend.src.core.auth.config]
 #
 # @INVARIANT: A single engine instance is used for the entire application.

@@ -31,11 +31,13 @@ from pathlib import Path
 # [/SECTION]

 # [DEF:BASE_DIR:Variable]
+# @TIER: TRIVIAL
 # @PURPOSE: Base directory for the backend.
 BASE_DIR = Path(__file__).resolve().parent.parent.parent
 # [/DEF:BASE_DIR:Variable]

 # [DEF:DATABASE_URL:Constant]
+# @TIER: TRIVIAL
 # @PURPOSE: URL for the main application database.
 DEFAULT_POSTGRES_URL = os.getenv(
    "POSTGRES_URL",
@@ -45,34 +47,39 @@ DATABASE_URL = os.getenv("DATABASE_URL", DEFAULT_POSTGRES_URL)
 # [/DEF:DATABASE_URL:Constant]

 # [DEF:TASKS_DATABASE_URL:Constant]
+# @TIER: TRIVIAL
 # @PURPOSE: URL for the tasks execution database.
 # Defaults to DATABASE_URL to keep task logs in the same PostgreSQL instance.
 TASKS_DATABASE_URL = os.getenv("TASKS_DATABASE_URL", DATABASE_URL)
 # [/DEF:TASKS_DATABASE_URL:Constant]

 # [DEF:AUTH_DATABASE_URL:Constant]
+# @TIER: TRIVIAL
 # @PURPOSE: URL for the authentication database.
 AUTH_DATABASE_URL = os.getenv("AUTH_DATABASE_URL", auth_config.AUTH_DATABASE_URL)
 # [/DEF:AUTH_DATABASE_URL:Constant]

 # [DEF:engine:Variable]
+# @TIER: TRIVIAL
+# @PURPOSE: SQLAlchemy engine for mappings database.
+# @SIDE_EFFECT: Creates database engine and manages connection pool.
 def _build_engine(db_url: str):
    with belief_scope("_build_engine"):
        if db_url.startswith("sqlite"):
            return create_engine(db_url, connect_args={"check_same_thread": False})
        return create_engine(db_url, pool_pre_ping=True)

-
-# @PURPOSE: SQLAlchemy engine for mappings database.
 engine = _build_engine(DATABASE_URL)
 # [/DEF:engine:Variable]

 # [DEF:tasks_engine:Variable]
+# @TIER: TRIVIAL
 # @PURPOSE: SQLAlchemy engine for tasks database.
 tasks_engine = _build_engine(TASKS_DATABASE_URL)
 # [/DEF:tasks_engine:Variable]

 # [DEF:auth_engine:Variable]
+# @TIER: TRIVIAL
 # @PURPOSE: SQLAlchemy engine for authentication database.
 auth_engine = _build_engine(AUTH_DATABASE_URL)
 # [/DEF:auth_engine:Variable]
@@ -99,6 +106,7 @@ AuthSessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=auth_eng
 # [/DEF:AuthSessionLocal:Class]

 # [DEF:_ensure_user_dashboard_preferences_columns:Function]
+# @TIER: STANDARD
 # @PURPOSE: Applies additive schema upgrades for user_dashboard_preferences table.
 # @PRE: bind_engine points to application database where profile table is stored.
 # @POST: Missing columns are added without data loss.
@@ -165,6 +173,7 @@ def _ensure_user_dashboard_preferences_columns(bind_engine):


 # [DEF:_ensure_user_dashboard_preferences_health_columns:Function]
+# @TIER: STANDARD
 # @PURPOSE: Applies additive schema upgrades for user_dashboard_preferences table (health fields).
 def _ensure_user_dashboard_preferences_health_columns(bind_engine):
    with belief_scope("_ensure_user_dashboard_preferences_health_columns"):
@@ -208,6 +217,7 @@ def _ensure_user_dashboard_preferences_health_columns(bind_engine):


 # [DEF:_ensure_llm_validation_results_columns:Function]
+# @TIER: STANDARD
 # @PURPOSE: Applies additive schema upgrades for llm_validation_results table.
 def _ensure_llm_validation_results_columns(bind_engine):
    with belief_scope("_ensure_llm_validation_results_columns"):
@@ -247,6 +257,7 @@ def _ensure_llm_validation_results_columns(bind_engine):


 # [DEF:_ensure_git_server_configs_columns:Function]
+# @TIER: STANDARD
 # @PURPOSE: Applies additive schema upgrades for git_server_configs table.
 # @PRE: bind_engine points to application database.
 # @POST: Missing columns are added without data loss.
@@ -284,6 +295,7 @@ def _ensure_git_server_configs_columns(bind_engine):


 # [DEF:ensure_connection_configs_table:Function]
+# @TIER: STANDARD
 # @PURPOSE: Ensures the external connection registry table exists in the main database.
 # @PRE: bind_engine points to the application database.
 # @POST: connection_configs table exists without dropping existing data.
@@ -301,6 +313,7 @@ def ensure_connection_configs_table(bind_engine):


 # [DEF:init_db:Function]
+# @TIER: STANDARD
 # @PURPOSE: Initializes the database by creating all tables.
 # @PRE: engine, tasks_engine and auth_engine are initialized.
 # @POST: Database tables created in all databases.
@@ -318,6 +331,7 @@ def init_db():
 # [/DEF:init_db:Function]

 # [DEF:get_db:Function]
+# @TIER: STANDARD
 # @PURPOSE: Dependency for getting a database session.
 # @PRE: SessionLocal is initialized.
 # @POST:    Session is closed after use.
@@ -332,6 +346,7 @@ def get_db():
 # [/DEF:get_db:Function]

 # [DEF:get_tasks_db:Function]
+# @TIER: STANDARD
 # @PURPOSE: Dependency for getting a tasks database session.
 # @PRE: TasksSessionLocal is initialized.
 # @POST:    Session is closed after use.
@@ -346,6 +361,7 @@ def get_tasks_db():
 # [/DEF:get_tasks_db:Function]

 # [DEF:get_auth_db:Function]
+# @TIER: STANDARD
 # @PURPOSE: Dependency for getting an authentication database session.
 # @PRE: AuthSessionLocal is initialized.
 # @POST:    Session is closed after use.
--- a/backend/src/core/task_manager/manager.py
+++ b/backend/src/core/task_manager/manager.py
@@ -3,7 +3,12 @@
 # @SEMANTICS: task, manager, lifecycle, execution, state
 # @PURPOSE: Manages the lifecycle of tasks, including their creation, execution, and state tracking. It uses a thread pool to run plugins asynchronously.
 # @LAYER: Core
-# @RELATION: Depends on PluginLoader to get plugin instances. It is used by the API layer to create and query tasks.
+# @PRE: Plugin loader and database sessions are initialized.
+# @POST: Orchestrates task execution and persistence.
+# @SIDE_EFFECT: Spawns worker threads and flushes logs to DB.
+# @DATA_CONTRACT: Input[plugin_id, params] -> Model[Task, LogEntry]
+# @RELATION: [DEPENDS_ON] ->[backend.src.core.plugin_loader]
+# @RELATION: [DEPENDS_ON] ->[backend.src.core.task_manager.persistence]
 # @INVARIANT: Task IDs are unique.
 # @CONSTRAINT: Must use belief_scope for logging.
 # @TEST_CONTRACT: TaskManagerModule -> {
@@ -33,9 +38,9 @@ from ..logger import logger, belief_scope, should_log_task_level
 # [/SECTION]

 # [DEF:TaskManager:Class]
+# @TIER: CRITICAL
 # @SEMANTICS: task, manager, lifecycle, execution, state
 # @PURPOSE: Manages the lifecycle of tasks, including their creation, execution, and state tracking.
-# @TIER: CRITICAL
 # @INVARIANT: Task IDs are unique within the registry.
 # @INVARIANT: Each task has exactly one status at any time.
 # @INVARIANT: Log entries are never deleted after being added to a task.
@@ -62,6 +67,7 @@ class TaskManager:
    LOG_FLUSH_INTERVAL = 2.0
    
    # [DEF:__init__:Function]
+    # @TIER: CRITICAL
    # @PURPOSE: Initialize the TaskManager with dependencies.
    # @PRE:     plugin_loader is initialized.
    # @POST:    TaskManager is ready to accept tasks.
@@ -95,6 +101,7 @@ class TaskManager:
    # [/DEF:__init__:Function]
    
    # [DEF:_flusher_loop:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Background thread that periodically flushes log buffer to database.
    # @PRE: TaskManager is initialized.
    # @POST: Logs are batch-written to database every LOG_FLUSH_INTERVAL seconds.
@@ -106,6 +113,7 @@ class TaskManager:
    # [/DEF:_flusher_loop:Function]
    
    # [DEF:_flush_logs:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Flush all buffered logs to the database.
    # @PRE: None.
    # @POST: All buffered logs are written to task_logs table.
@@ -132,6 +140,7 @@ class TaskManager:
    # [/DEF:_flush_logs:Function]
    
    # [DEF:_flush_task_logs:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Flush logs for a specific task immediately.
    # @PRE: task_id exists.
    # @POST: Task's buffered logs are written to database.
@@ -150,6 +159,7 @@ class TaskManager:
    # [/DEF:_flush_task_logs:Function]

    # [DEF:create_task:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Creates and queues a new task for execution.
    # @PRE:     Plugin with plugin_id exists. Params are valid.
    # @POST:    Task is created, added to registry, and scheduled for execution.
@@ -179,6 +189,7 @@ class TaskManager:
    # [/DEF:create_task:Function]

    # [DEF:_run_task:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Internal method to execute a task with TaskContext support.
    # @PRE:     Task exists in registry.
    # @POST:    Task is executed, status updated to SUCCESS or FAILED.
@@ -246,6 +257,7 @@ class TaskManager:
    # [/DEF:_run_task:Function]

    # [DEF:resolve_task:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Resumes a task that is awaiting mapping.
    # @PRE:     Task exists and is in AWAITING_MAPPING state.
    # @POST:    Task status updated to RUNNING, params updated, execution resumed.
@@ -270,6 +282,7 @@ class TaskManager:
    # [/DEF:resolve_task:Function]

    # [DEF:wait_for_resolution:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Pauses execution and waits for a resolution signal.
    # @PRE:     Task exists.
    # @POST:    Execution pauses until future is set.
@@ -292,6 +305,7 @@ class TaskManager:
    # [/DEF:wait_for_resolution:Function]

    # [DEF:wait_for_input:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Pauses execution and waits for user input.
    # @PRE:     Task exists.
    # @POST:    Execution pauses until future is set via resume_task_with_password.
@@ -313,6 +327,7 @@ class TaskManager:
    # [/DEF:wait_for_input:Function]

    # [DEF:get_task:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Retrieves a task by its ID.
    # @PRE:     task_id is a string.
    # @POST:    Returns Task object or None.
@@ -324,6 +339,7 @@ class TaskManager:
    # [/DEF:get_task:Function]

    # [DEF:get_all_tasks:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Retrieves all registered tasks.
    # @PRE:     None.
    # @POST:    Returns list of all Task objects.
@@ -334,6 +350,7 @@ class TaskManager:
    # [/DEF:get_all_tasks:Function]

    # [DEF:get_tasks:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Retrieves tasks with pagination and optional status filter.
    # @PRE:     limit and offset are non-negative integers.
    # @POST:    Returns a list of tasks sorted by start_time descending.
@@ -374,6 +391,7 @@ class TaskManager:
    # [/DEF:get_tasks:Function]

    # [DEF:get_task_logs:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Retrieves logs for a specific task (from memory for running, persistence for completed).
    # @PRE:     task_id is a string.
    # @POST:    Returns list of LogEntry or TaskLog objects.
@@ -406,6 +424,7 @@ class TaskManager:
    # [/DEF:get_task_logs:Function]
    
    # [DEF:get_task_log_stats:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Get statistics about logs for a task.
    # @PRE: task_id is a valid task ID.
    # @POST: Returns LogStats with counts by level and source.
@@ -417,6 +436,7 @@ class TaskManager:
    # [/DEF:get_task_log_stats:Function]
    
    # [DEF:get_task_log_sources:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Get unique sources for a task's logs.
    # @PRE: task_id is a valid task ID.
    # @POST: Returns list of unique source strings.
@@ -428,6 +448,7 @@ class TaskManager:
    # [/DEF:get_task_log_sources:Function]

    # [DEF:_add_log:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Adds a log entry to a task buffer and notifies subscribers.
    # @PRE:     Task exists.
    # @POST:    Log added to buffer and pushed to queues (if level meets task_log_level filter).
@@ -480,6 +501,7 @@ class TaskManager:
    # [/DEF:_add_log:Function]

    # [DEF:subscribe_logs:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Subscribes to real-time logs for a task.
    # @PRE:     task_id is a string.
    # @POST:    Returns an asyncio.Queue for log entries.
@@ -495,6 +517,7 @@ class TaskManager:
    # [/DEF:subscribe_logs:Function]

    # [DEF:unsubscribe_logs:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Unsubscribes from real-time logs for a task.
    # @PRE:     task_id is a string, queue is asyncio.Queue.
    # @POST:    Queue removed from subscribers.
@@ -510,6 +533,7 @@ class TaskManager:
    # [/DEF:unsubscribe_logs:Function]

    # [DEF:load_persisted_tasks:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Load persisted tasks using persistence service.
    # @PRE:     None.
    # @POST:    Persisted tasks loaded into self.tasks.
@@ -522,6 +546,7 @@ class TaskManager:
    # [/DEF:load_persisted_tasks:Function]

    # [DEF:await_input:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Transition a task to AWAITING_INPUT state with input request.
    # @PRE:     Task exists and is in RUNNING state.
    # @POST:    Task status changed to AWAITING_INPUT, input_request set, persisted.
@@ -544,6 +569,7 @@ class TaskManager:
    # [/DEF:await_input:Function]

    # [DEF:resume_task_with_password:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Resume a task that is awaiting input with provided passwords.
    # @PRE:     Task exists and is in AWAITING_INPUT state.
    # @POST:    Task status changed to RUNNING, passwords injected, task resumed.
@@ -573,6 +599,7 @@ class TaskManager:
    # [/DEF:resume_task_with_password:Function]

    # [DEF:clear_tasks:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Clears tasks based on status filter (also deletes associated logs).
    # @PRE:     status is Optional[TaskStatus].
    # @POST:    Tasks matching filter (or all non-active) cleared from registry and database.
--- a/backend/src/core/task_manager/persistence.py
+++ b/backend/src/core/task_manager/persistence.py
@@ -3,7 +3,12 @@
 # @SEMANTICS: persistence, sqlite, sqlalchemy, task, storage
 # @PURPOSE: Handles the persistence of tasks using SQLAlchemy and the tasks.db database.
 # @LAYER: Core
-# @RELATION: Used by TaskManager to save and load tasks.
+# @PRE: Tasks database must be initialized with TaskRecord and TaskLogRecord schemas.
+# @POST: Provides reliable storage and retrieval for task metadata and logs.
+# @SIDE_EFFECT: Performs database I/O on tasks.db.
+# @DATA_CONTRACT: Input[Task, LogEntry] -> Model[TaskRecord, TaskLogRecord]
+# @RELATION: [USED_BY] ->[backend.src.core.task_manager.manager.TaskManager]
+# @RELATION: [DEPENDS_ON] ->[backend.src.core.database.TasksSessionLocal]
 # @INVARIANT: Database schema must match the TaskRecord model structure.

 # [SECTION: IMPORTS]
@@ -118,6 +123,7 @@ class TaskPersistenceService:
    # [/DEF:_resolve_environment_id:Function]

    # [DEF:__init__:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Initializes the persistence service.
    # @PRE:     None.
    # @POST:    Service is ready.
@@ -128,6 +134,7 @@ class TaskPersistenceService:
    # [/DEF:__init__:Function]

    # [DEF:persist_task:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Persists or updates a single task in the database.
    # @PRE:     isinstance(task, Task)
    # @POST:    Task record created or updated in database.
@@ -190,6 +197,7 @@ class TaskPersistenceService:
    # [/DEF:persist_task:Function]

    # [DEF:persist_tasks:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Persists multiple tasks.
    # @PRE:     isinstance(tasks, list)
    # @POST:    All tasks in list are persisted.
@@ -201,6 +209,7 @@ class TaskPersistenceService:
    # [/DEF:persist_tasks:Function]

    # [DEF:load_tasks:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Loads tasks from the database.
    # @PRE:     limit is an integer.
    # @POST:    Returns list of Task objects.
@@ -255,6 +264,7 @@ class TaskPersistenceService:
    # [/DEF:load_tasks:Function]

    # [DEF:delete_tasks:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Deletes specific tasks from the database.
    # @PRE:     task_ids is a list of strings.
    # @POST:    Specified task records deleted from database.
@@ -277,9 +287,9 @@ class TaskPersistenceService:
 # [/DEF:TaskPersistenceService:Class]

 # [DEF:TaskLogPersistenceService:Class]
+# @TIER: CRITICAL
 # @SEMANTICS: persistence, service, database, log, sqlalchemy
 # @PURPOSE: Provides methods to save and query task logs from the task_logs table.
-# @TIER: CRITICAL
 # @RELATION: DEPENDS_ON -> TaskLogRecord
 # @INVARIANT: Log entries are batch-inserted for performance.
 #
@@ -311,6 +321,7 @@ class TaskLogPersistenceService:
    # [/DEF:__init__:Function]
    
    # [DEF:add_logs:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Batch insert log entries for a task.
    # @PRE: logs is a list of LogEntry objects.
    # @POST: All logs inserted into task_logs table.
@@ -342,6 +353,7 @@ class TaskLogPersistenceService:
    # [/DEF:add_logs:Function]
    
    # [DEF:get_logs:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Query logs for a task with filtering and pagination.
    # @PRE: task_id is a valid task ID.
    # @POST: Returns list of TaskLog objects matching filters.
@@ -394,6 +406,7 @@ class TaskLogPersistenceService:
    # [/DEF:get_logs:Function]
    
    # [DEF:get_log_stats:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Get statistics about logs for a task.
    # @PRE: task_id is a valid task ID.
    # @POST: Returns LogStats with counts by level and source.
@@ -439,6 +452,7 @@ class TaskLogPersistenceService:
    # [/DEF:get_log_stats:Function]
    
    # [DEF:get_sources:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Get unique sources for a task's logs.
    # @PRE: task_id is a valid task ID.
    # @POST: Returns list of unique source strings.
@@ -458,6 +472,7 @@ class TaskLogPersistenceService:
    # [/DEF:get_sources:Function]
    
    # [DEF:delete_logs_for_task:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Delete all logs for a specific task.
    # @PRE: task_id is a valid task ID.
    # @POST: All logs for the task are deleted.
@@ -479,6 +494,7 @@ class TaskLogPersistenceService:
    # [/DEF:delete_logs_for_task:Function]
    
    # [DEF:delete_logs_for_tasks:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Delete all logs for multiple tasks.
    # @PRE: task_ids is a list of task IDs.
    # @POST: All logs for the tasks are deleted.
--- a/backend/src/dependencies.py
+++ b/backend/src/dependencies.py
@@ -1,4 +1,5 @@
 # [DEF:Dependencies:Module]
+# @TIER: STANDARD
 # @SEMANTICS: dependency, injection, singleton, factory, auth, jwt
 # @PURPOSE: Manages creation and provision of shared application dependencies, such as PluginLoader and TaskManager, to avoid circular imports.
 # @LAYER: Core
@@ -39,6 +40,7 @@ init_db()
 config_manager = ConfigManager(config_path=str(config_path))

 # [DEF:get_config_manager:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Dependency injector for ConfigManager.
 # @PRE: Global config_manager must be initialized.
 # @POST: Returns shared ConfigManager instance.
@@ -69,6 +71,7 @@ logger.info("ResourceService initialized")
 # initialize them inside the dependency functions.

 # [DEF:get_plugin_loader:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Dependency injector for PluginLoader.
 # @PRE: Global plugin_loader must be initialized.
 # @POST: Returns shared PluginLoader instance.
@@ -79,6 +82,7 @@ def get_plugin_loader() -> PluginLoader:
 # [/DEF:get_plugin_loader:Function]

 # [DEF:get_task_manager:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Dependency injector for TaskManager.
 # @PRE: Global task_manager must be initialized.
 # @POST: Returns shared TaskManager instance.
@@ -89,6 +93,7 @@ def get_task_manager() -> TaskManager:
 # [/DEF:get_task_manager:Function]

 # [DEF:get_scheduler_service:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Dependency injector for SchedulerService.
 # @PRE: Global scheduler_service must be initialized.
 # @POST: Returns shared SchedulerService instance.
@@ -99,6 +104,7 @@ def get_scheduler_service() -> SchedulerService:
 # [/DEF:get_scheduler_service:Function]

 # [DEF:get_resource_service:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Dependency injector for ResourceService.
 # @PRE: Global resource_service must be initialized.
 # @POST: Returns shared ResourceService instance.
@@ -109,6 +115,7 @@ def get_resource_service() -> ResourceService:
 # [/DEF:get_resource_service:Function]

 # [DEF:get_mapping_service:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Dependency injector for MappingService.
 # @PRE: Global config_manager must be initialized.
 # @POST: Returns new MappingService instance.
@@ -122,6 +129,7 @@ def get_mapping_service() -> MappingService:
 _clean_release_repository = CleanReleaseRepository()

 # [DEF:get_clean_release_repository:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Legacy compatibility shim for CleanReleaseRepository.
 # @POST: Returns a shared CleanReleaseRepository instance.
 def get_clean_release_repository() -> CleanReleaseRepository:
@@ -131,6 +139,7 @@ def get_clean_release_repository() -> CleanReleaseRepository:


 # [DEF:get_clean_release_facade:Function]
+# @TIER: TRIVIAL
 # @PURPOSE: Dependency injector for CleanReleaseFacade.
 # @POST: Returns a facade instance with a fresh DB session.
 def get_clean_release_facade(db = Depends(get_db)) -> CleanReleaseFacade:
@@ -159,11 +168,13 @@ def get_clean_release_facade(db = Depends(get_db)) -> CleanReleaseFacade:
 # [/DEF:get_clean_release_facade:Function]

 # [DEF:oauth2_scheme:Variable]
+# @TIER: TRIVIAL
 # @PURPOSE: OAuth2 password bearer scheme for token extraction.
 oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/login")
 # [/DEF:oauth2_scheme:Variable]

 # [DEF:get_current_user:Function]
+# @TIER: STANDARD
 # @PURPOSE: Dependency for retrieving currently authenticated user from a JWT.
 # @PRE:     JWT token provided in Authorization header.
 # @POST:    Returns User object if token is valid.
@@ -193,6 +204,7 @@ def get_current_user(token: str = Depends(oauth2_scheme), db = Depends(get_auth_
 # [/DEF:get_current_user:Function]

 # [DEF:has_permission:Function]
+# @TIER: STANDARD
 # @PURPOSE: Dependency for checking if the current user has a specific permission.
 # @PRE:     User is authenticated.
 # @POST:    Returns True if user has permission.
--- a/backend/src/models/clean_release.py
+++ b/backend/src/models/clean_release.py
@@ -3,6 +3,10 @@
 # @SEMANTICS: clean-release, models, lifecycle, compliance, evidence, immutability
 # @PURPOSE: Define canonical clean release domain entities and lifecycle guards.
 # @LAYER: Domain
+# @PRE: Base mapping model and release enums are available.
+# @POST: Provides SQLAlchemy and dataclass definitions for governance domain.
+# @SIDE_EFFECT: None (schema definition).
+# @DATA_CONTRACT: Model[ReleaseCandidate, CandidateArtifact, DistributionManifest, ComplianceRun, ComplianceReport]
 # @INVARIANT: Immutable snapshots are never mutated; forbidden lifecycle transitions are rejected.

 from datetime import datetime
--- a/backend/src/models/report.py
+++ b/backend/src/models/report.py
@@ -3,7 +3,11 @@
 # @SEMANTICS: reports, models, pydantic, normalization, pagination
 # @PURPOSE: Canonical report schemas for unified task reporting across heterogeneous task types.
 # @LAYER: Domain
-# @RELATION: DEPENDS_ON -> backend.src.core.task_manager.models
+# @PRE: Pydantic library and task manager models are available.
+# @POST: Provides validated schemas for cross-plugin reporting and UI consumption.
+# @SIDE_EFFECT: None (schema definition).
+# @DATA_CONTRACT: Model[TaskReport, ReportCollection, ReportDetailView]
+# @RELATION: [DEPENDS_ON] ->[backend.src.core.task_manager.models]
 # @INVARIANT: Canonical report fields are always present for every report item.

 # [SECTION: IMPORTS]
--- a/backend/src/services/auth_service.py
+++ b/backend/src/services/auth_service.py
@@ -11,6 +11,10 @@
 # @RELATION:  [DEPENDS_ON] ->[backend.src.models.auth.Role]
 #
 # @INVARIANT: Authentication succeeds only for active users with valid credentials; issued sessions encode subject and scopes from assigned roles.
+# @PRE:       Core auth models and security utilities available.
+# @POST:      User identity verified and session tokens issued according to role scopes.
+# @SIDE_EFFECT: Writes last login timestamps and JIT-provisions external users.
+# @DATA_CONTRACT: [Credentials | ADFSClaims] -> [UserEntity | SessionToken]

 # [SECTION: IMPORTS]
 from typing import Dict, Any
@@ -23,9 +27,11 @@ from ..core.logger import belief_scope
 # [/SECTION]

 # [DEF:AuthService:Class]
+# @TIER: STANDARD
 # @PURPOSE: Provides high-level authentication services.
 class AuthService:
    # [DEF:__init__:Function]
+    # @TIER: TRIVIAL
    # @PURPOSE: Initializes the authentication service with repository access over an active DB session.
    # @PRE: db is a valid SQLAlchemy Session instance bound to the auth persistence context.
    # @POST: self.repo is initialized and ready for auth user/role CRUD operations.
@@ -37,6 +43,7 @@ class AuthService:
    # [/DEF:__init__:Function]

    # [DEF:authenticate_user:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Validates credentials and account state for local username/password authentication.
    # @PRE: username and password are non-empty credential inputs.
    # @POST: Returns User only when user exists, is active, and password hash verification succeeds; otherwise returns None.
@@ -62,6 +69,7 @@ class AuthService:
    # [/DEF:authenticate_user:Function]

    # [DEF:create_session:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Issues an access token payload for an already authenticated user.
    # @PRE: user is a valid User entity containing username and iterable roles with role.name values.
    # @POST: Returns session dict with non-empty access_token and token_type='bearer'.
@@ -87,6 +95,7 @@ class AuthService:
    # [/DEF:create_session:Function]

    # [DEF:provision_adfs_user:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Performs ADFS Just-In-Time provisioning and role synchronization from AD group mappings.
    # @PRE: user_info contains identity claims where at least one of 'upn' or 'email' is present; 'groups' may be absent.
    # @POST: Returns persisted user entity with roles synchronized to mapped AD groups and refreshed state.
@@ -121,7 +130,6 @@ class AuthService:
            self.repo.db.refresh(user)
            return user
    # [/DEF:provision_adfs_user:Function]
-
 # [/DEF:AuthService:Class]

 # [/DEF:backend.src.services.auth_service:Module]
--- a/backend/src/services/health_service.py
+++ b/backend/src/services/health_service.py
@@ -3,9 +3,9 @@
 # @SEMANTICS: health, aggregation, dashboards
 # @PURPOSE: Business logic for aggregating dashboard health status from validation records.
 # @LAYER: Domain/Service
-# @RELATION: DEPENDS_ON -> ValidationRecord
-# @RELATION: DEPENDS_ON -> backend.src.core.superset_client.SupersetClient
-# @RELATION: DEPENDS_ON -> backend.src.core.task_manager.cleanup.TaskCleanupService
+# @RELATION: [DEPENDS_ON] ->[backend.src.models.llm.ValidationRecord]
+# @RELATION: [DEPENDS_ON] ->[backend.src.core.superset_client.SupersetClient]
+# @RELATION: [DEPENDS_ON] ->[backend.src.core.task_manager.cleanup.TaskCleanupService]

 from typing import List, Dict, Any, Optional, Tuple
 import time
--- a/backend/src/services/resource_service.py
+++ b/backend/src/services/resource_service.py
@@ -18,10 +18,12 @@ from ..core.logger import logger, belief_scope
 # [/SECTION]

 # [DEF:ResourceService:Class]
+# @TIER: STANDARD
 # @PURPOSE: Provides centralized access to resource data with enhanced metadata
 class ResourceService:
    
    # [DEF:__init__:Function]
+    # @TIER: TRIVIAL
    # @PURPOSE: Initialize the resource service with dependencies
    # @PRE: None
    # @POST: ResourceService is ready to fetch resources
@@ -32,15 +34,16 @@ class ResourceService:
    # [/DEF:__init__:Function]
    
    # [DEF:get_dashboards_with_status:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Fetch dashboards from environment with Git status and last task status
    # @PRE: env is a valid Environment object
    # @POST: Returns list of dashboards with enhanced metadata
    # @PARAM: env (Environment) - The environment to fetch from
    # @PARAM: tasks (List[Task]) - List of tasks to check for status
    # @RETURN: List[Dict] - Dashboards with git_status and last_task fields
-    # @RELATION: CALLS -> SupersetClient.get_dashboards_summary
-    # @RELATION: CALLS -> self._get_git_status_for_dashboard
-    # @RELATION: CALLS -> self._get_last_llm_task_for_dashboard
+    # @RELATION: CALLS ->[SupersetClient:get_dashboards_summary]
+    # @RELATION: CALLS ->[self:_get_git_status_for_dashboard]
+    # @RELATION: CALLS ->[self:_get_last_llm_task_for_dashboard]
    async def get_dashboards_with_status(
        self, 
        env: Any, 
@@ -81,6 +84,7 @@ class ResourceService:
    # [/DEF:get_dashboards_with_status:Function]

    # [DEF:get_dashboards_page_with_status:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Fetch one dashboard page from environment and enrich only that page with status metadata.
    # @PRE: env is valid; page >= 1; page_size > 0.
    # @POST: Returns page items plus total counters without scanning all pages locally.
@@ -144,6 +148,7 @@ class ResourceService:
    # [/DEF:get_dashboards_page_with_status:Function]

    # [DEF:_get_last_llm_task_for_dashboard:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Get most recent LLM validation task for a dashboard in an environment
    # @PRE: dashboard_id is a valid integer identifier
    # @POST: Returns the newest llm_dashboard_validation task summary or None
@@ -224,6 +229,7 @@ class ResourceService:
    # [/DEF:_get_last_llm_task_for_dashboard:Function]

    # [DEF:_normalize_task_status:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Normalize task status to stable uppercase values for UI/API projections
    # @PRE: raw_status can be enum or string
    # @POST: Returns uppercase status without enum class prefix
@@ -240,6 +246,7 @@ class ResourceService:
    # [/DEF:_normalize_task_status:Function]

    # [DEF:_normalize_validation_status:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Normalize LLM validation status to PASS/FAIL/WARN/UNKNOWN
    # @PRE: raw_status can be any scalar type
    # @POST: Returns normalized validation status token or None
@@ -255,6 +262,7 @@ class ResourceService:
    # [/DEF:_normalize_validation_status:Function]

    # [DEF:_normalize_datetime_for_compare:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Normalize datetime values to UTC-aware values for safe comparisons.
    # @PRE: value may be datetime or any scalar.
    # @POST: Returns UTC-aware datetime; non-datetime values map to minimal UTC datetime.
@@ -269,14 +277,15 @@ class ResourceService:
    # [/DEF:_normalize_datetime_for_compare:Function]
    
    # [DEF:get_datasets_with_status:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Fetch datasets from environment with mapping progress and last task status
    # @PRE: env is a valid Environment object
    # @POST: Returns list of datasets with enhanced metadata
    # @PARAM: env (Environment) - The environment to fetch from
    # @PARAM: tasks (List[Task]) - List of tasks to check for status
    # @RETURN: List[Dict] - Datasets with mapped_fields and last_task fields
-    # @RELATION: CALLS -> SupersetClient.get_datasets_summary
-    # @RELATION: CALLS -> self._get_last_task_for_resource
+    # @RELATION: CALLS ->[SupersetClient:get_datasets_summary]
+    # @RELATION: CALLS ->[self:_get_last_task_for_resource]
    async def get_datasets_with_status(
        self, 
        env: Any, 
@@ -307,6 +316,7 @@ class ResourceService:
    # [/DEF:get_datasets_with_status:Function]
    
    # [DEF:get_activity_summary:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Get summary of active and recent tasks for the activity indicator
    # @PRE: tasks is a list of Task objects
    # @POST: Returns summary with active_count and recent_tasks
@@ -346,12 +356,13 @@ class ResourceService:
    # [/DEF:get_activity_summary:Function]
    
    # [DEF:_get_git_status_for_dashboard:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Get Git sync status for a dashboard
    # @PRE: dashboard_id is a valid integer
    # @POST: Returns git status or None if no repo exists
    # @PARAM: dashboard_id (int) - The dashboard ID
    # @RETURN: Optional[Dict] - Git status with branch and sync_status
-    # @RELATION: CALLS -> GitService.get_repo
+    # @RELATION: CALLS ->[GitService:get_repo]
    def _get_git_status_for_dashboard(self, dashboard_id: int) -> Optional[Dict[str, Any]]:
        try:
            repo = self.git_service.get_repo(dashboard_id)
@@ -405,6 +416,7 @@ class ResourceService:
    # [/DEF:_get_git_status_for_dashboard:Function]
    
    # [DEF:_get_last_task_for_resource:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Get the most recent task for a specific resource
    # @PRE: resource_id is a valid string
    # @POST: Returns task summary or None if no tasks found
@@ -442,6 +454,7 @@ class ResourceService:
    # [/DEF:_get_last_task_for_resource:Function]
    
    # [DEF:_extract_resource_name_from_task:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Extract resource name from task params
    # @PRE: task is a valid Task object
    # @POST: Returns resource name or task ID
@@ -453,6 +466,7 @@ class ResourceService:
    # [/DEF:_extract_resource_name_from_task:Function]
    
    # [DEF:_extract_resource_type_from_task:Function]
+    # @TIER: STANDARD
    # @PURPOSE: Extract resource type from task params
    # @PRE: task is a valid Task object
    # @POST: Returns resource type or 'unknown'
@@ -462,6 +476,5 @@ class ResourceService:
        params = task.params or {}
        return params.get('resource_type', 'unknown')
    # [/DEF:_extract_resource_type_from_task:Function]
-
 # [/DEF:ResourceService:Class]
 # [/DEF:backend.src.services.resource_service:Module]
--- a/specs/020-task-reports-design/tasks.md
+++ b/specs/020-task-reports-design/tasks.md
@@ -130,6 +130,10 @@
 - [x] T043 Update semantic map generator to ignore few-shot examples under `.ai/shots/` (`generate_semantic_map.py`)
 - [x] T044 Fix semantic map generator Svelte relation parsing and prevent path-based CRITICAL over-promotion for nested route entities (`generate_semantic_map.py`)
 - [x] T045 Preserve latest dashboard validation task identity while falling back only the displayed validation result and broaden Svelte multiline `@RELATION` parsing (`backend/src/services/resource_service.py`, `backend/src/services/__tests__/test_resource_service.py`, `generate_semantic_map.py`)
+- [-] T046 Execute `speckit.semantics` workflow with `fix` for semantic remediation
+  - **Outcome**: A semantic remediation pass was completed, but review gate verdict is **FAIL**. Semantic maintenance advanced the work but did not achieve closure/PASS.
+  - **Metrics**: Improvements from 1845 -> 1884 contracts and 432 -> 486 relations, with orphans reduced from 1530 -> 1398. Reviewer found current gate metrics at 1884 contracts / 486 relations / 1610 orphans / 301 unresolved relations.
+  - **Blockers**: CRITICAL metadata incompleteness in `backend/src/core/auth/repository.py`, `backend/src/core/config_manager.py`, `backend/src/core/task_manager/manager.py`, `backend/src/models/report.py`, systemic unresolved relations in `backend/src/api/routes/admin.py` and `backend/src/api/routes/assistant.py`, and missing frontend semantic coverage such as `frontend/src/routes/reports/+page.svelte`.

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