fix(psa): fix time entry AttributeError and show all users in member mapping

- Fix create_time_entry() using self._client instead of self.client
- GET /member-mappings now returns all active account users, not just mapped
  ones — allows manual assignment when auto-match by email doesn't work
- PsaMemberMappingResponse mapping fields are now Optional (id, external_member_id,
  external_member_name, matched_by) to represent unmapped users
- Frontend MemberMappingTab skips null external_member_id when building
  localMappings, and derives user list from all returned entries
- Add docs/connectwise-psa-testing-checklist.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/api/endpoints/integrations.py

@@ -517,31 +517,37 @@ async def get_member_mappings(
     current_user: Annotated[User, Depends(require_account_owner)],
     db: Annotated[AsyncSession, Depends(get_db)],
 ):
-    """Get all member mappings for the account."""
+    """Get all account users with their PSA member mappings (unmapped users included)."""
     conn = await _get_account_connection(current_user.account_id, db)
     if not conn:
         return []
 
-    result = await db.execute(
+    # Fetch all active account users
+    users_result = await db.execute(
+        select(User).where(User.account_id == current_user.account_id, User.is_active.is_(True))
+    )
+    users = users_result.scalars().all()
+
+    # Fetch all existing mappings keyed by user_id for O(1) lookup
+    mappings_result = await db.execute(
         select(PsaMemberMapping).where(PsaMemberMapping.psa_connection_id == conn.id)
     )
-    mappings = result.scalars().all()
+    mapping_by_user: dict[str, PsaMemberMapping] = {
+        str(m.user_id): m for m in mappings_result.scalars().all()
+    }
 
-    response = []
-    for m in mappings:
-        user_result = await db.execute(select(User).where(User.id == m.user_id))
-        user = user_result.scalar_one_or_none()
-        if user:
-            response.append(PsaMemberMappingResponse(
-                id=str(m.id),
-                user_id=str(m.user_id),
-                user_email=user.email,
-                user_name=user.name,
-                external_member_id=m.external_member_id,
-                external_member_name=m.external_member_name,
-                matched_by=m.matched_by,
-            ))
-    return response
+    return [
+        PsaMemberMappingResponse(
+            id=str(m.id) if (m := mapping_by_user.get(str(user.id))) else None,
+            user_id=str(user.id),
+            user_email=user.email,
+            user_name=user.name,
+            external_member_id=m.external_member_id if m else None,
+            external_member_name=m.external_member_name if m else None,
+            matched_by=m.matched_by if m else None,
+        )
+        for user in users
+    ]
 
 
 @router.post("/member-mappings", response_model=list[PsaMemberMappingResponse])

backend/app/schemas/psa_connection.py

@@ -111,13 +111,13 @@ class PsaPostLogResponse(BaseModel):
 
 
 class PsaMemberMappingResponse(BaseModel):
-    id: str
+    id: str | None = None  # None for users without a mapping
     user_id: str
     user_email: str
     user_name: str
-    external_member_id: str
-    external_member_name: str
-    matched_by: str
+    external_member_id: str | None = None
+    external_member_name: str | None = None
+    matched_by: str | None = None
 
 
 class PsaMemberMappingSaveRequest(BaseModel):

backend/app/services/psa/connectwise/provider.py

@@ -536,7 +536,7 @@ class ConnectWiseProvider(PSAProvider):
         if work_type:
             payload["workType"] = {"name": work_type}
 
-        data = await self._client.post("/time/entries", payload)
+        data = await self.client.post("/time/entries", payload)
         return PSATimeEntry(
             id=str(data["id"]),
             ticket_id=ticket_id,