"""LangChain integrations for AgentDB.
Exports:
- ``AgentDBVectorStore`` — A ``langchain_core.vectorstores.VectorStore``
implementation backed by AgentDB's native HNSW vector index.
- ``AgentDBChatMessageHistory`` — A ``langchain_core.chat_history.BaseChatMessageHistory``
implementation that persists conversation messages in AgentDB.
- ``AgentDBChatMemory`` — A ``langchain_core.memory.BaseMemory`` wrapper
around ``AgentDBChatMessageHistory`` for use with older LCEL / chain
patterns. ``None`` when the installed ``langchain-core`` version does not
expose ``BaseMemory``.
"""
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