feat: switch backend indexing to code-first identifiers

app/schemas/schemas.py

@@ -43,9 +43,7 @@ class TaskBase(BaseModel):
 
 
 class TaskCreate(TaskBase):
-    project_id: Optional[int] = None
     project_code: Optional[str] = None
-    milestone_id: Optional[int] = None
     milestone_code: Optional[str] = None
     reporter_id: Optional[int] = None
     assignee_id: Optional[int] = None
@@ -75,15 +73,12 @@ class TaskUpdate(BaseModel):
 
 
 class TaskResponse(TaskBase):
-    id: int
     status: TaskStatusEnum
     task_code: Optional[str] = None
     code: Optional[str] = None
     type: Optional[str] = None
     due_date: Optional[datetime] = None
-    project_id: int
     project_code: Optional[str] = None
-    milestone_id: int
     milestone_code: Optional[str] = None
     reporter_id: int
     assignee_id: Optional[int] = None
@@ -94,8 +89,8 @@ class TaskResponse(TaskBase):
     positions: Optional[str] = None
     pending_matters: Optional[str] = None
     # BE-PR-008: Proposal Accept tracking
-    source_proposal_id: Optional[int] = None
-    source_essential_id: Optional[int] = None
+    source_proposal_code: Optional[str] = None
+    source_essential_code: Optional[str] = None
     created_at: datetime
     updated_at: Optional[datetime] = None
     
@@ -259,9 +254,9 @@ class MilestoneUpdate(BaseModel):
 
 
 class MilestoneResponse(MilestoneBase):
-    id: int
     milestone_code: Optional[str] = None
-    project_id: int
+    code: Optional[str] = None
+    project_code: Optional[str] = None
     created_by_id: Optional[int] = None
     started_at: Optional[datetime] = None
     created_at: datetime
@@ -285,7 +280,7 @@ class ProposalBase(BaseModel):
 
 
 class ProposalCreate(ProposalBase):
-    project_id: Optional[int] = None
+    pass
 
 
 class ProposalUpdate(BaseModel):
@@ -294,11 +289,10 @@ class ProposalUpdate(BaseModel):
 
 
 class ProposalResponse(ProposalBase):
-    id: int
     proposal_code: Optional[str] = None  # preferred name
     propose_code: Optional[str] = None   # backward compat alias (same value)
     status: ProposalStatusEnum
-    project_id: int
+    project_code: Optional[str] = None
     created_by_id: Optional[int] = None
     created_by_username: Optional[str] = None
     feat_task_id: Optional[str] = None   # DEPRECATED (BE-PR-010): legacy field, read-only. Use generated_tasks instead.
@@ -340,9 +334,8 @@ class EssentialUpdate(BaseModel):
 
 
 class EssentialResponse(EssentialBase):
-    id: int
     essential_code: str
-    proposal_id: int
+    proposal_code: Optional[str] = None
     created_by_id: Optional[int] = None
     created_at: datetime
     updated_at: Optional[datetime] = None
@@ -353,13 +346,12 @@ class EssentialResponse(EssentialBase):
 
 class GeneratedTaskBrief(BaseModel):
     """Brief info about a story task generated from Proposal Accept."""
-    task_id: int
     task_code: Optional[str] = None
     task_type: str
     task_subtype: Optional[str] = None
     title: str
     status: Optional[str] = None
-    source_essential_id: Optional[int] = None
+    source_essential_code: Optional[str] = None
 
 
 class ProposalDetailResponse(ProposalResponse):
@@ -374,12 +366,10 @@ class ProposalDetailResponse(ProposalResponse):
 
 class GeneratedTaskSummary(BaseModel):
     """Brief summary of a task generated from a Proposal Essential."""
-    task_id: int
     task_code: str
     task_type: str
     task_subtype: str
     title: str
-    essential_id: int
     essential_code: str