fastapi==0.115.4
uvicorn[standard]==0.31.0
pydantic==2.9.2
pydantic-settings==2.5.2
python-multipart==0.0.9
python-dateutil==2.9.0.post0
httpx==0.27.2

# LangChain stack
langchain==0.2.16
langchain-openai==0.1.25
openai==1.40.6

# LangGraph + sqlite checkpoint
langgraph==0.2.34
aiosqlite==0.20.0

langgraph-checkpoint-sqlite==2.0.11
geopandas==0.14.4
shapely==2.0.4
pyproj==3.6.1
pyogrio==0.9.0      # use as the read/write engine (fewer GDAL headaches than Fiona)
rtree==1.2.0        # optional: spatial index; skip if you don't use sindex