Log FTS index build failures at WARNING

CHANGELOG.md

@@ -1,6 +1,10 @@
 # Changelog
 ## [Unreleased]
 
+### Fixed
+
+- A failed FTS index build is logged at `WARNING` instead of `DEBUG`, so silent full-text search degradation is visible.
+
 ### Changed
 
 - A bare `${VAR}` in YAML config now raises `MissingEnvVarError` when the variable is set but empty, matching the unset case. Use `${VAR:-default}` to allow an empty/absent value.

haiku_rag_slim/haiku/rag/store/repositories/chunk.py

@@ -33,8 +33,7 @@ class ChunkRepository:
                 replace=True,
             )
         except Exception as e:
-            # Log the error but don't fail - FTS might already exist
-            logger.debug(f"FTS index creation skipped: {e}")
+            logger.warning(f"FTS index build failed; full-text search degraded: {e}")
 
     def _contextualize_content(self, chunk: Chunk) -> str:
         """Generate contextualized content for FTS by prepending headings."""

tests/test_chunk.py

@@ -510,3 +510,34 @@ async def test_chunk_content_fts_without_headings(temp_db_path):
         # Both should be the same when no headings
         assert record["content"] == "Plain content without headings."
         assert record["content_fts"] == "Plain content without headings."
+
+
+async def test_ensure_fts_index_warns_on_failure(temp_db_path):
+    """A failed FTS index build is surfaced at WARNING, not swallowed silently."""
+    import logging
+
+    from haiku.rag.store.repositories import chunk as chunk_module
+
+    async with HaikuRAG(db_path=temp_db_path, config=Config, create=True) as client:
+        repo = client.chunk_repository
+
+        async def _boom(*_args, **_kwargs):
+            raise RuntimeError("index build failed")
+
+        repo.store.chunks_table.create_index = _boom
+
+        records: list[logging.LogRecord] = []
+
+        class _Capture(logging.Handler):
+            def emit(self, record: logging.LogRecord) -> None:
+                records.append(record)
+
+        handler = _Capture(level=logging.WARNING)
+        chunk_module.logger.addHandler(handler)
+        try:
+            await repo._ensure_fts_index()
+        finally:
+            chunk_module.logger.removeHandler(handler)
+
+        assert [r for r in records if r.levelno == logging.WARNING]
+        assert any("index build failed" in r.getMessage() for r in records)