Use MariaDB connection pooling instead of single connection

src/ddns_service/config.py

@@ -144,6 +144,7 @@ def load_config(config_path):
 
     cfg.setdefault("database", {})
     cfg["database"].setdefault("backend", "sqlite")
+    cfg["database"].setdefault("pool_size", 5)
 
     cfg.setdefault("dns_service", {})
     cfg["dns_service"].setdefault("dns_server", "127.0.0.1")

src/ddns_service/models.py

@@ -14,9 +14,9 @@ from peewee import (
     ForeignKeyField,
     IntegerField,
     Model,
-    MySQLDatabase,
     SqliteDatabase,
 )
+from playhouse.pool import PooledMySQLDatabase
 
 # Database proxy (initialized later with actual backend)
 db = DatabaseProxy()
@@ -124,12 +124,13 @@ def init_database(config: dict):
         logging.debug(f"Database backend: SQLite path={db_path}")
 
     elif backend == "mariadb":
-        actual_db = MySQLDatabase(
+        actual_db = PooledMySQLDatabase(
             config["database"]["database"],
             host=config["database"].get("host", "localhost"),
             port=config["database"].get("port", 3306),
             user=config["database"]["user"],
             password=config["database"]["password"],
+            max_connections=config["database"].get("pool_size", 5),
         )
         db.initialize(actual_db)
         db_name = config['database']['database']