Add thread notifications, SEO topic pages, and fix quiz auto-advance

Notifications: a new "thread" type notifies every other commenter on a
post whenever anyone comments on it, disregarding reply hierarchy -
excluding the actor and whoever already got a comment/reply
notification for that same event, so no one is double-notified.
Implemented via a background-deferred fan-out mirroring the existing
mention-notification pattern.

SEO: discussion_forum_posting() now embeds up to 20 of a post's
comments as nested schema.org Comment entities (not just an aggregate
count), and a new /topics hub plus /topics/{topic} pages give the
feed's topic filter real, independently crawlable/indexable URLs -
/feed?topic=X was never indexable since its canonical strips the
query string back to bare /feed. Both are wired end to end (schemas,
Devii actions, docs API, sitemap, locustfile load-test coverage).

Quiz player: the auto-advance to the next question used to hide the
just-answered slide in the same tick as rendering the grade, so on
any multi-question quiz the Correct/Not correct feedback was never
actually visible before the view moved on. Delayed via setTimeout,
with the pending timer cleared on manual navigation and on
disconnect so it can't race or fire on a removed component.

Also includes other local changes already in progress in this
working tree before this session (messaging, push delivery,
deepsearch jobs, game economy, quiz builder) - verified by the full
suite passing (3467 tests) but not authored or individually reviewed
in this session.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VL9Xn57W5UR3HZbbuuzxdK

devplacepy/database/schema.py

@@ -1,6 +1,6 @@
 # retoor <retoor@molodetz.nl>
 
-from .core import DEFAULT_CORRECTION_PROMPT, DEFAULT_MODIFIER_PROMPT, INTERNAL_GATEWAY_URL, _drop_index, _index, _uid_index, db, defaultdict, get_table, logger
+from .core import AQUALITY_NEWS_GRADING_MODEL, AQUALITY_NEWS_GRADING_URL, DEFAULT_CORRECTION_PROMPT, DEFAULT_MODIFIER_PROMPT, INTERNAL_GATEWAY_URL, _drop_index, _index, _uid_index, db, defaultdict, get_table, logger
 from .settings import get_setting, set_setting
 from .soft_delete import SOFT_DELETE_TABLES, ensure_soft_delete_columns
 from .ranking import _authors_cache
@@ -130,6 +130,7 @@ def init_db():
         ("content", ""),
         ("read", False),
         ("created_at", ""),
+        ("updated_at", ""),
     ):
         if not messages.has_column(column):
             messages.create_column_by_example(column, example)
@@ -144,6 +145,7 @@ def init_db():
         "idx_messages_conversation_rev",
         ["receiver_uid", "sender_uid"],
     )
+    _index(db, "messages", "idx_messages_updated_at", ["updated_at"])
     _index(db, "notifications", "idx_notifications_user", ["user_uid"])
     _index(db, "notifications", "idx_notifications_user_read", ["user_uid", "read"])
     push_registration = get_table("push_registration")
@@ -155,19 +157,38 @@ def init_db():
         ("key_auth", ""),
         ("key_p256dh", ""),
         ("token", ""),
+        ("client_id", ""),
+        ("environment", ""),
         ("created_at", ""),
+        ("registered_at", ""),
         ("deleted_at", ""),
     ):
         if not push_registration.has_column(column):
             push_registration.create_column_by_example(column, example)
     _index(db, "push_registration", "idx_push_registration_user", ["user_uid"])
     _index(db, "push_registration", "idx_push_registration_provider", ["provider"])
+    _index(
+        db,
+        "push_registration",
+        "idx_push_registration_client",
+        ["user_uid", "provider", "client_id"],
+    )
+    _index(
+        db,
+        "push_registration",
+        "idx_push_registration_token",
+        ["user_uid", "provider", "token"],
+    )
     if "push_registration" in db.tables:
         with db:
             db.query(
                 "UPDATE push_registration SET provider = 'webpush' "
                 "WHERE provider IS NULL OR provider = ''"
             )
+            db.query(
+                "UPDATE push_registration SET registered_at = created_at "
+                "WHERE registered_at IS NULL OR registered_at = ''"
+            )
     _index(db, "sessions", "idx_sessions_token", ["session_token"])
     projects = get_table("projects")
     for column, example in (
@@ -1799,8 +1820,8 @@ def init_db():
         news_defaults = {
             "news_grade_threshold": "7",
             "news_api_url": "https://news.app.molodetz.nl/api",
-            "news_ai_url": INTERNAL_GATEWAY_URL,
-            "news_ai_model": "molodetz",
+            "news_ai_url": AQUALITY_NEWS_GRADING_URL,
+            "news_ai_model": AQUALITY_NEWS_GRADING_MODEL,
         }
         for key, value in news_defaults.items():
             existing = db["site_settings"].find_one(key=key)
@@ -2046,6 +2067,12 @@ def migrate_ai_gateway_settings() -> None:
         if get_setting(key, "") == OLD_GATEWAY_URL:
             set_setting(key, INTERNAL_GATEWAY_URL)
             logger.info(f"Migrated {key} to the internal gateway")
+    if get_setting("news_ai_url", "") == INTERNAL_GATEWAY_URL:
+        set_setting("news_ai_url", AQUALITY_NEWS_GRADING_URL)
+        logger.info("Migrated news_ai_url to the free aquality grading model")
+    if get_setting("news_ai_model", "") in ("molodetz", ""):
+        set_setting("news_ai_model", AQUALITY_NEWS_GRADING_MODEL)
+        logger.info("Migrated news_ai_model to aquality")
     if get_setting("bot_model", "") == "deepseek-chat":
         set_setting("bot_model", "molodetz")
         logger.info("Migrated bot_model to molodetz")