Implement dual DB pools (primary + maintenance) and wire services

example.env

@@ -45,6 +45,15 @@ OXICLOUD_DB_CONNECTION_STRING=postgres://postgres:postgres@postgres/oxicloud
 # Minimum number of database connections to maintain (default: 5)
 #OXICLOUD_DB_MIN_CONNECTIONS=5
 
+# Maximum connections for the maintenance pool (background/batch tasks).
+# This pool is isolated from user requests, preventing background operations
+# (verify_integrity, garbage_collect, storage recalculation) from starving
+# interactive traffic. Default: 5
+#OXICLOUD_DB_MAINTENANCE_MAX_CONNECTIONS=5
+
+# Minimum connections for the maintenance pool. Default: 1
+#OXICLOUD_DB_MAINTENANCE_MIN_CONNECTIONS=1
+
 # Build-time database URL for SQLx compile-time checks
 # Only needed during compilation, not at runtime
 DATABASE_URL=postgres://postgres:postgres@localhost:5432/oxicloud