fix: improve connection to postgres to raise business logic exception

And raises delay between each new try

app/consumer/src/adapters/postgres.py

@@ -4,21 +4,22 @@ import time
 import psycopg2
 from psycopg2.extensions import connection
 from ports import DeviceRepository, ReadingRepository
+from exceptions import DatabaseConnectionError
 
 log = logging.getLogger(__name__)
 
-
-def connect(uri: str) -> connection:
-    for _ in range(10):
+def connect(uri: str, retries: int = 10, base_delay: float = 1.0) -> connection:
+    for attempt in range(retries):
         try:
             conn = psycopg2.connect(uri)
             conn.autocommit = True
             log.info("PostgreSQL connecté")
             return conn
-        except Exception as e:
-            log.warning("Attente PostgreSQL... (%s)", e)
-            time.sleep(3)
-    raise RuntimeError("Impossible de se connecter à PostgreSQL")
+        except psycopg2.OperationalError as e:
+            delay = min(base_delay * 2 ** attempt, 30.0)
+            log.warning("Attente PostgreSQL (tentative %d/%d) : %s", attempt + 1, retries, e)
+            time.sleep(delay)
+    raise DatabaseConnectionError(f"Impossible de se connecter après {retries} tentatives")
 
 
 class PgDeviceRepository(DeviceRepository):