fix: sanitize SQL and narrow exception handling in indexer

src/companion/rag/indexer.py

@@ -6,7 +6,7 @@ from typing import Dict, Iterator, List
 from companion.config import Config
 from companion.rag.chunker import Chunk, ChunkingRule, chunk_file
 from companion.rag.embedder import OllamaEmbedder
-from companion.rag.vector_store import VectorStore
+from companion.rag.vector_store import VectorStore, TABLE_NAME
 
 
 class Indexer:
@@ -106,8 +106,8 @@ class Indexer:
 
     def full_index(self) -> None:
         try:
-            self.vector_store.table.drop()
-        except Exception:
+            self.vector_store.db.drop_table(TABLE_NAME)
+        except (FileNotFoundError, ValueError):
             pass
         self.vector_store.table = self.vector_store._get_or_create_table()
 
@@ -120,10 +120,11 @@ class Indexer:
             relative_path = file_path.relative_to(self.vault_path).as_posix()
             modified_at = file_path.stat().st_mtime
 
+            escaped_path = relative_path.replace("'", "''")
             results = (
                 self.vector_store.table.search()
                 .limit(1)
-                .where(f"source_file = '{relative_path}'")
+                .where(f"source_file = '{escaped_path}'")
                 .to_list()
             )