perf(ci): relax Postgres durability in integration shards (fsync off)

Option 1 (pooling the teardown connection) left teardowns at ~1.5-2s/test, so
the cost is the per-test TRUNCATE's commit forcing an fsync, not the connect
handshake. Each shard now ALTER SYSTEM SETs fsync/synchronous_commit/
full_page_writes off + pg_reload_conf() right after deps install, before
alembic — sighup/user-context GUCs apply with no restart. The DB is ephemeral
(rebuilt per run) so fsync-off is safe; the step is non-fatal so a perms
surprise can't red a shard. Speeds up every test's commit (setup inserts +
the teardown TRUNCATE), stacking on the pooled engine from the prior commit.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.forgejo/workflows/ci.yml

@@ -168,6 +168,15 @@ jobs:
           else
             pip install -r requirements.txt pytest pytest-asyncio
           fi
+          # Relax durability on the throwaway CI Postgres so the per-test
+          # TRUNCATE's commit-fsync — the integration teardown's dominant cost
+          # (~1.5-2s/test per --durations, unchanged by pooling the teardown
+          # connection) — is skipped. fsync/full_page_writes are sighup GUCs and
+          # synchronous_commit is user-context, so ALTER SYSTEM + pg_reload_conf()
+          # applies them with NO restart. Ephemeral DB ⇒ fsync-off is safe.
+          # Non-fatal so a perms surprise can't red the shard; fabledcurator is
+          # the postgres image's bootstrap superuser.
+          python -c "import os,psycopg; c=psycopg.connect(host=os.environ['DB_HOST'],port=5432,user=os.environ['DB_USER'],password=os.environ['DB_PASSWORD'],dbname=os.environ['DB_NAME'],autocommit=True); [c.execute(q) for q in ('ALTER SYSTEM SET fsync=off','ALTER SYSTEM SET synchronous_commit=off','ALTER SYSTEM SET full_page_writes=off','SELECT pg_reload_conf()')]; c.close()" || echo 'WARN: durability GUC relax failed (continuing)'
           alembic upgrade head
           pytest tests/test_api_*.py -v -m integration --durations=15
 
@@ -226,6 +235,15 @@ jobs:
           else
             pip install -r requirements.txt pytest pytest-asyncio
           fi
+          # Relax durability on the throwaway CI Postgres so the per-test
+          # TRUNCATE's commit-fsync — the integration teardown's dominant cost
+          # (~1.5-2s/test per --durations, unchanged by pooling the teardown
+          # connection) — is skipped. fsync/full_page_writes are sighup GUCs and
+          # synchronous_commit is user-context, so ALTER SYSTEM + pg_reload_conf()
+          # applies them with NO restart. Ephemeral DB ⇒ fsync-off is safe.
+          # Non-fatal so a perms surprise can't red the shard; fabledcurator is
+          # the postgres image's bootstrap superuser.
+          python -c "import os,psycopg; c=psycopg.connect(host=os.environ['DB_HOST'],port=5432,user=os.environ['DB_USER'],password=os.environ['DB_PASSWORD'],dbname=os.environ['DB_NAME'],autocommit=True); [c.execute(q) for q in ('ALTER SYSTEM SET fsync=off','ALTER SYSTEM SET synchronous_commit=off','ALTER SYSTEM SET full_page_writes=off','SELECT pg_reload_conf()')]; c.close()" || echo 'WARN: durability GUC relax failed (continuing)'
           alembic upgrade head
           pytest tests/test_importer*.py tests/test_import_*.py tests/test_migration_*.py tests/test_phash_*.py tests/test_sidecar_*.py tests/test_scan_*.py tests/test_archive_extractor.py tests/test_backfill_phash.py -v -m integration --durations=15
 
@@ -284,6 +302,15 @@ jobs:
           else
             pip install -r requirements.txt pytest pytest-asyncio
           fi
+          # Relax durability on the throwaway CI Postgres so the per-test
+          # TRUNCATE's commit-fsync — the integration teardown's dominant cost
+          # (~1.5-2s/test per --durations, unchanged by pooling the teardown
+          # connection) — is skipped. fsync/full_page_writes are sighup GUCs and
+          # synchronous_commit is user-context, so ALTER SYSTEM + pg_reload_conf()
+          # applies them with NO restart. Ephemeral DB ⇒ fsync-off is safe.
+          # Non-fatal so a perms surprise can't red the shard; fabledcurator is
+          # the postgres image's bootstrap superuser.
+          python -c "import os,psycopg; c=psycopg.connect(host=os.environ['DB_HOST'],port=5432,user=os.environ['DB_USER'],password=os.environ['DB_PASSWORD'],dbname=os.environ['DB_NAME'],autocommit=True); [c.execute(q) for q in ('ALTER SYSTEM SET fsync=off','ALTER SYSTEM SET synchronous_commit=off','ALTER SYSTEM SET full_page_writes=off','SELECT pg_reload_conf()')]; c.close()" || echo 'WARN: durability GUC relax failed (continuing)'
           alembic upgrade head
           pytest tests/ -v -m integration --durations=15 \
             --ignore-glob='tests/test_api_*.py' \