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Prevent table-creation race: gunicorn --preload

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With 2 workers, both ran Base.metadata.create_all() at import on an empty DB,
racing on CREATE TABLE (duplicate pg_type for "projects"). --preload imports
the app once in the master before forking, so tables are created a single time.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Nick Siegfried
2026-06-16 16:03:38 -07:00
parent c010bc22a0
commit a02f7ec511
1 changed files with 3 additions and 1 deletions
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@@ -4,5 +4,7 @@ COPY server/requirements.txt ./server/
RUN pip install --no-cache-dir -r server/requirements.txt RUN pip install --no-cache-dir -r server/requirements.txt
COPY server/ ./server/ COPY server/ ./server/
EXPOSE 8000 EXPOSE 8000
CMD ["gunicorn", "-k", "uvicorn.workers.UvicornWorker", \ # --preload imports the app once in the master (so create_all runs a single time)
# before forking workers, preventing a table-creation race on first startup.
CMD ["gunicorn", "-k", "uvicorn.workers.UvicornWorker", "--preload", \
"-b", "0.0.0.0:8000", "--workers", "2", "server.app:app"] "-b", "0.0.0.0:8000", "--workers", "2", "server.app:app"]