Why this change is needed:
Prevent potential errors when embedding_func does not have model_name set,
which could cause table naming issues in PostgreSQL.
How it solves it:
- Check if model_suffix is not empty before appending to table name
- Fall back to base table name with a warning if model_suffix is unavailable
- Log clear warning message to alert users about missing model isolation
Impact:
- Prevents crashes when model_name is not configured
- Provides clear feedback to users about configuration issues
- Maintains backward compatibility with configs that don't set model_name
Testing:
Existing PostgreSQL tests validate the happy path. This adds defensive handling
for edge cases.
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