Two bugs fixed:
1. Cross-connection COPY: DuckDB doesn't support referencing another
connection's tables as src.serving.table. Replace with Arrow as
intermediate: src reads to Arrow, dst.register() + CREATE TABLE.
2. Catalog/schema name collision: naming the export file serving.duckdb
made DuckDB assign catalog name "serving" — same as the schema we
create inside it. Every serving.table query became ambiguous. Rename
to analytics.duckdb (catalog "analytics", schema "serving" = no clash).
SERVING_DUCKDB_PATH values updated: serving.duckdb → analytics.duckdb
in supervisor, service, bootstrap, dev_run.sh, .env.example, docker-compose.
3. Temp file: use _export.duckdb (not serving.duckdb.tmp) to avoid
the same catalog collision during the write phase.
Verified: 6 tables exported, serving.* queries work read-only.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Split the single lakehouse.duckdb into two files to eliminate the exclusive
write-lock conflict between SQLMesh (pipeline) and the Quart web app (reader):
lakehouse.duckdb — SQLMesh exclusive (all pipeline layers)
serving.duckdb — web app reads (serving tables only, atomically swapped)
Changes:
web/src/beanflows/analytics.py
- Replace persistent global _conn with per-thread connections (threading.local)
- Add _get_conn(): opens read_only=True on first call per thread, reopens
automatically on inode change (~1μs os.stat) to pick up atomic file swaps
- Switch env var from DUCKDB_PATH → SERVING_DUCKDB_PATH
- Add module docstring documenting architecture + DuckLake migration path
web/src/beanflows/app.py
- Startup check: use SERVING_DUCKDB_PATH
- Health check: use _db_path instead of _conn
src/materia/export_serving.py (new)
- Reads all serving.* tables from lakehouse.duckdb (read_only)
- Writes to serving_new.duckdb, then os.rename → serving.duckdb (atomic)
- ~50 lines; runs after each SQLMesh transform
src/materia/pipelines.py
- Add export_serving pipeline entry (uv run python -c ...)
infra/supervisor/supervisor.sh
- Add SERVING_DUCKDB_PATH env var comment
- Add export step: uv run materia pipeline run export_serving
infra/supervisor/materia-supervisor.service
- Add Environment=SERVING_DUCKDB_PATH=/data/materia/serving.duckdb
infra/bootstrap_supervisor.sh
- Add SERVING_DUCKDB_PATH to .env template
web/.env.example + web/docker-compose.yml
- Document both env vars; switch web service to SERVING_DUCKDB_PATH
web/src/beanflows/dashboard/templates/settings.html
- Minor settings page fix from prior session
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
