fix: polish sanitizer and repair messaging

Agent-Logs-Url: https://github.com/MemPalace/mempalace/sessions/775f2fc4-3051-462e-8586-6d694b55da0d

Co-authored-by: igorls <4753812+igorls@users.noreply.github.com>

mempalace/cli.py

@@ -228,7 +228,8 @@ def cmd_repair(args):
     if os.path.exists(backup_path):
         if not contains_palace_database(backup_path):
             print(
-                "  Cannot proceed: backup path exists but is not a valid palace database. "
+                "  Cannot proceed: backup path exists but does not contain a valid palace backup "
+                "(expected chroma.sqlite3). "
                 f"Please remove or rename: {backup_path}"
             )
             return

mempalace/query_sanitizer.py

@@ -67,13 +67,21 @@ def sanitize_query(raw_query: str) -> dict:
     raw_query = raw_query.strip()
     original_length = len(raw_query)
 
+    def _strip_wrapping_quotes(candidate: str) -> str:
+        candidate = candidate.strip()
+        while candidate[:1] in {"'", '"'} or candidate[-1:] in {"'", '"'}:
+            candidate = candidate.strip("\"'")
+            if not candidate:
+                return ""
+        return candidate
+
     def _trim_candidate(candidate: str) -> str:
-        candidate = candidate.strip().strip("\"'")
+        candidate = _strip_wrapping_quotes(candidate)
         if len(candidate) <= MAX_QUERY_LENGTH:
             return candidate
 
         nested_fragments = [
-            frag.strip().strip("\"'") for frag in _SENTENCE_SPLIT.split(candidate) if frag.strip()
+            _strip_wrapping_quotes(frag) for frag in _SENTENCE_SPLIT.split(candidate) if frag.strip()
         ]
         for frag in reversed(nested_fragments):
             if MIN_QUERY_LENGTH <= len(frag) <= MAX_QUERY_LENGTH:

tests/test_migrate.py

@@ -22,8 +22,10 @@ def test_migrate_aborts_without_confirmation(tmp_path, capsys):
     palace_dir.mkdir()
     (palace_dir / "chroma.sqlite3").write_text("db")
 
-    mock_chromadb = SimpleNamespace(__version__="0.6.0", PersistentClient=MagicMock())
-    mock_chromadb.PersistentClient.side_effect = Exception("unreadable")
+    mock_chromadb = SimpleNamespace(
+        __version__="0.6.0",
+        PersistentClient=MagicMock(side_effect=Exception("unreadable")),
+    )
 
     with (
         patch.dict("sys.modules", {"chromadb": mock_chromadb}),