API:

RERANK API:

    Receive: JSON with "hits" and "query", each 'hit' with

        qid     : ?int
        docid   : !string
        datasetid: !string
        content : !string
        score   : !int|float
    
    Return: Same as Receive

EXPLAIN API:

    Receive: JSON with "query" and "metadata" all with type 'str'
    Return: 'str' as explanation

ENV:

    LLM_API_MODEL: LLM model name
    LLM_API_BASE: LLM API base
    LLM_API_KEYS: API keys separated by ','

    RERANK_WINDOW_SIZE: Metadata number rerank will do rerank
    RERANK_STEP_SIZE: Times reranker will do rerank

    CACHE_DIR: Flask Cache saving path
    CACHE_TIMEOUT: Flask Cache timeout

    DB_HOST, DB_PORT, DB_USER, DB_PSWD, DB_NAME: MySQL connection info

    TB_DESCRIPTIONS: Table name for descriptions
    TB_DESCRIPTIONS_ID: Column name for dataset id
    TB_DESCRIPTIONS_DESC: Column name for enhanced descriptions