feat(cases): link provider-owned evidence references

src/govoplan_cases/backend/schemas.py

@@ -82,6 +82,36 @@ class CaseUpdateRequest(BaseModel):
     metadata: dict[str, Any] | None = None
 
 
+class CaseOwnerReferenceRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    owner_module: str = Field(min_length=1, max_length=120)
+    kind: str = Field(min_length=1, max_length=120)
+    object_id: str = Field(min_length=1, max_length=1_000)
+    tenant_id: str = Field(min_length=1, max_length=255)
+    version: str = Field(min_length=1, max_length=255)
+    path: str = Field(min_length=1, max_length=2_000)
+
+
+class CaseEvidenceLinkRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    expected_revision: int = Field(ge=1)
+    recorded_at: datetime
+    change_reason: str = Field(min_length=1, max_length=1_000)
+    idempotency_key: str = Field(min_length=1, max_length=255)
+    reference: CaseOwnerReferenceRequest
+
+
+class CaseEvidenceUnlinkRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    expected_revision: int = Field(ge=1)
+    recorded_at: datetime
+    change_reason: str = Field(min_length=1, max_length=1_000)
+    idempotency_key: str = Field(min_length=1, max_length=255)
+
+
 class CaseDecisionRequest(BaseModel):
     model_config = ConfigDict(extra="forbid")
 
@@ -113,6 +143,8 @@ class CaseTimelineResponse(BaseModel):
 __all__ = [
     "CaseGrantRequest",
     "CaseDecisionRequest",
+    "CaseEvidenceLinkRequest",
+    "CaseEvidenceUnlinkRequest",
     "CaseHistoryResponse",
     "CaseListResponse",
     "CaseStatusWriteRequest",