fix: DB connection healthchecks

Author: odesenfans

src/aleph/config.py

@@ -185,6 +185,10 @@ def get_defaults():
             "password": "decentralize-everything",
             # Maximum number of concurrent connections to the local PostgreSQL database.
             "pool_size": 50,
+            # Check if DB connections are still alive before reusing them.
+            "pool_pre_ping": True,
+            # Recycle DB connections after this many seconds of inactivity.
+            "pool_recycle": 3600,
         },
         "ipfs": {
             # Whether to enable storage and communication on IPFS.

src/aleph/db/connection.py

@@ -60,6 +60,8 @@ def make_engine(
         ),
         echo=echo,
         pool_size=config.postgres.pool_size.value,
+        pool_pre_ping=config.postgres.pool_pre_ping.value,
+        pool_recycle=config.postgres.pool_recycle.value,
     )