feat(api): CUST-WP-0018 — API hardening & code quality

T01: Fix datetime.utcnow() → datetime.now(tz=timezone.utc) in MCP server
T02: Wrap _get/_post/_patch/_delete with try/except; return error dicts
T03: Log warnings when write_log skips missing project path
T04: Add priority + due_date_before filters to GET /tasks/
T05: Add owner + slug filters to GET /workstreams/
T06: Add offset param to GET /progress/ for proper pagination
T07: Low-severity bundle:
  - CORS origins from CORS_ORIGINS env var (TD-017)
  - seed.py upsert domains+topics on re-run (TD-011)
  - normalise filter bar CSS → filter-text-input everywhere (TD-016)
  - add 30.5 avg-days-per-month comment in decisions.md (TD-019)
  - TD-009, TD-018 already resolved by existing code

Closes CUST-WP-0018.

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

scripts/seed.py

@@ -82,7 +82,7 @@ TOPICS = [
 
 async def seed() -> None:
     async with async_session_factory() as session:
-        # ── Insert domains (idempotent) ───────────────────────────────────────
+        # ── Upsert domains ────────────────────────────────────────────────────
         domain_by_slug: dict[str, Domain] = {}
         for data in DOMAINS:
             existing = await session.execute(
@@ -90,7 +90,11 @@ async def seed() -> None:
             )
             domain = existing.scalar_one_or_none()
             if domain is not None:
-                print(f"  skip domain (exists): {data['slug']}")
+                if domain.name != data["name"]:
+                    domain.name = data["name"]
+                    print(f"  update domain: {data['slug']}")
+                else:
+                    print(f"  skip domain (no change): {data['slug']}")
             else:
                 domain = Domain(slug=data["slug"], name=data["name"])
                 session.add(domain)
@@ -98,24 +102,35 @@ async def seed() -> None:
                 print(f"  insert domain: {data['slug']}")
             domain_by_slug[data["slug"]] = domain
 
-        # ── Insert topics (idempotent) ─────────────────────────────────────────
+        # ── Upsert topics ─────────────────────────────────────────────────────
         for data in TOPICS:
             existing = await session.execute(
                 select(Topic).where(Topic.slug == data["slug"])
             )
-            if existing.scalar_one_or_none() is not None:
-                print(f"  skip topic (exists): {data['slug']}")
-                continue
+            topic = existing.scalar_one_or_none()
             domain = domain_by_slug[data["domain_slug"]]
-            topic = Topic(
-                slug=data["slug"],
-                title=data["title"],
-                description=data["description"],
-                domain_id=domain.id,
-                status=TopicStatus.active,
-            )
-            session.add(topic)
-            print(f"  insert topic: {data['slug']}")
+            if topic is not None:
+                changed = False
+                if topic.title != data["title"]:
+                    topic.title = data["title"]
+                    changed = True
+                if topic.description != data["description"]:
+                    topic.description = data["description"]
+                    changed = True
+                if topic.domain_id != domain.id:
+                    topic.domain_id = domain.id
+                    changed = True
+                print(f"  {'update' if changed else 'skip'} topic ({'changed' if changed else 'no change'}): {data['slug']}")
+            else:
+                topic = Topic(
+                    slug=data["slug"],
+                    title=data["title"],
+                    description=data["description"],
+                    domain_id=domain.id,
+                    status=TopicStatus.active,
+                )
+                session.add(topic)
+                print(f"  insert topic: {data['slug']}")
 
         await session.commit()
     await engine.dispose()