fix(backup): log missing db config instead of raising

- Use module logger in backup/db.py
- Skip db dump when no databases.csv entry is present
- Apply black/formatting cleanup across backup/restore/tests

https://chatgpt.com/share/69519d45-b0dc-800f-acb6-6fb8504e9b46

src/baudolo/restore/__init__.py

@@ -1 +1 @@
-__all__ = ["main"]
+__all__ = ["main"]

src/baudolo/restore/__main__.py

@@ -66,7 +66,9 @@ def main(argv: list[str] | None = None) -> int:
     # ------------------------------------------------------------------
     # mariadb
     # ------------------------------------------------------------------
-    p_mdb = sub.add_parser("mariadb", help="Restore a single MariaDB/MySQL-compatible dump")
+    p_mdb = sub.add_parser(
+        "mariadb", help="Restore a single MariaDB/MySQL-compatible dump"
+    )
     _add_common_backup_args(p_mdb)
     p_mdb.add_argument("--container", required=True)
     p_mdb.add_argument("--db-name", required=True)

src/baudolo/restore/db/__init__.py

@@ -1 +1 @@
-"""Database restore handlers (Postgres, MariaDB/MySQL)."""
+"""Database restore handlers (Postgres, MariaDB/MySQL)."""

src/baudolo/restore/db/mariadb.py

@@ -23,7 +23,9 @@ exit 42
             raise RuntimeError("empty client detection output")
         return out
     except Exception as e:
-        print("ERROR: neither 'mariadb' nor 'mysql' found in container.", file=sys.stderr)
+        print(
+            "ERROR: neither 'mariadb' nor 'mysql' found in container.", file=sys.stderr
+        )
         raise e
 
 
@@ -47,7 +49,14 @@ def restore_mariadb_sql(
         # MariaDB 11 images may not contain the mysql binary at all.
         docker_exec(
             container,
-            [client, "-u", user, f"--password={password}", "-e", "SET FOREIGN_KEY_CHECKS=0;"],
+            [
+                client,
+                "-u",
+                user,
+                f"--password={password}",
+                "-e",
+                "SET FOREIGN_KEY_CHECKS=0;",
+            ],
         )
 
         result = docker_exec(
@@ -80,10 +89,19 @@ def restore_mariadb_sql(
 
         docker_exec(
             container,
-            [client, "-u", user, f"--password={password}", "-e", "SET FOREIGN_KEY_CHECKS=1;"],
+            [
+                client,
+                "-u",
+                user,
+                f"--password={password}",
+                "-e",
+                "SET FOREIGN_KEY_CHECKS=1;",
+            ],
         )
 
     with open(sql_path, "rb") as f:
-        docker_exec(container, [client, "-u", user, f"--password={password}", db_name], stdin=f)
+        docker_exec(
+            container, [client, "-u", user, f"--password={password}", db_name], stdin=f
+        )
 
     print(f"MariaDB/MySQL restore complete for db '{db_name}'.")

src/baudolo/restore/files.py

@@ -6,7 +6,9 @@ import sys
 from .run import run, docker_volume_exists
 
 
-def restore_volume_files(volume_name: str, backup_files_dir: str, *, rsync_image: str) -> int:
+def restore_volume_files(
+    volume_name: str, backup_files_dir: str, *, rsync_image: str
+) -> int:
     if not os.path.isdir(backup_files_dir):
         print(f"ERROR: backup files dir not found: {backup_files_dir}", file=sys.stderr)
         return 2