backend env updates and brand json files

app/infrastructure/settings.py

@@ -140,6 +140,18 @@ DATABASE_URL = os.getenv(
     f"postgresql://{DB_USER}:{DB_PASSWORD}@{DB_HOST}:{DB_PORT}/{DB_NAME}",
 )
 
+# How often to re-run the brand-table <-> seed-catalog reconcile after boot.
+#
+# The startup run alone only catches what existed at boot. A brand table created
+# directly in the database while the server is up - by hand, by a script, or by
+# another machine sharing this database - is not mirrored into the seed catalogs
+# until the next restart. This interval is what closes that window.
+#
+# reconcile_brand_catalogs() is idempotent and non-destructive, so a sweep that
+# finds nothing to do costs one COUNT(*) per brand table and writes nothing.
+# 0 disables the loop, leaving the startup run and POST /api/system/brand-sync.
+BRAND_SYNC_INTERVAL_SECONDS = int(os.getenv("BRAND_SYNC_INTERVAL_SECONDS", "300"))
+
 # ---------------------------------------------------------------------------
 # S3 / DigitalOcean Spaces (product image storage) - optional
 # ---------------------------------------------------------------------------