[Bug] PageIndex long document indexing fails with custom OPENAI_API_BASE / 401 Unauthorized

[molezz]

• Description: When configuring a custom OpenAI-compatible proxy via OPENAI_API_BASE and OPENAI_API_KEY in .env, short documents process fine, but long documents (>20 pages) fail during index_long_document with litellm.AuthenticationError: 401 Unauthorized or API key not configured.

• Root Cause: openkb.indexer.index_long_document instantiates PageIndexClient without passing through the resolved base_url and api_key from the credential bundle, and pageindex.index.utils.llm_completion does not inject api_base/api_key into litellm.completion().

• Expected Behavior: PageIndexClient and its internal LiteLLM calls should inherit the active KB's resolved OPENAI_API_BASE and OPENAI_API_KEY.

Steps to Reproduce

1. Configure .env with a custom OpenAI-compatible proxy:

 
   OPENAI_API_BASE="http://your-proxy:port/v1"
   OPENAI_API_KEY="***"

2. Set model: openai/your-model in config.yaml.
3. Ingest a long PDF (>20 pages, e.g., 30 pages) via openkb add doc.pdf or watch service.
4. index_long_document triggers PageIndexClient, which throws litellm.AuthenticationError: Error code: 401 - {'error': 'API key required for remote API access'} because credentials are not forwarded to LiteLLM inside pageindex.index.utils.