feat(container): harden v0.1.1 publication

app/db/migrations.py

@@ -7,6 +7,7 @@ from importlib import resources
 import psycopg
 from alembic import command
 from alembic.config import Config
+from alembic.script import ScriptDirectory
 
 from app.core.config import Settings
 
@@ -61,15 +62,19 @@ def bootstrap_or_upgrade_to_head(settings: Settings) -> str:
 
 
 def current_revision(settings: Settings) -> str | None:
-    output: list[str] = []
+    """Read the database revision without applying or stamping migrations."""
+    with _connect(settings) as conn, conn.cursor() as cur:
+        cur.execute("SELECT version_num FROM alembic_version")
+        row = cur.fetchone()
+        return str(row[0]) if row else None
 
-    def capture(message: str, *_args, **_kwargs) -> None:
-        if message.strip():
-            output.append(message.strip())
 
-    config = get_alembic_config(settings)
-    command.current(config, verbose=False)
-    return output[-1] if output else None
+def head_revision(settings: Settings) -> str:
+    """Return the single packaged Alembic head without touching the database."""
+    heads = ScriptDirectory.from_config(get_alembic_config(settings)).get_heads()
+    if len(heads) != 1:
+        raise RuntimeError(f"expected one Alembic head, found {len(heads)}")
+    return heads[0]
 
 
 def _connect(settings: Settings) -> psycopg.Connection: