Initial: fingerprint DB + Takeout fetch + ingest flows

README.md

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+# photo-pipeline
+
+Prefect-orchestrated photo ingestion: Takeout download → fingerprint DB (dedup) → quality scan → Immich.
+
+## Components
+- `photo_db.py` — SQLite fingerprint DB (sha256 exact + phash/dhash near dupes; Takeout archive tracking)
+- `takeout_fetch.py` — flow: download (aria2c resume) → track sha256 → extract
+- `photo_ingest.py` — flow: scan dir → check dups → register new
+- `prefect.yaml` — deployments (fetch, ingest) on photo-pool
+
+## NixOS note
+Venv python needs LD_LIBRARY_PATH (gcc libstdc++ + zlib) — see run-python.sh / run-prefect.sh.
+
+## Run
+prefect deployment run "takeout-fetch/fetch" --param manifest=/path/urls.txt --param export_id=photos-2026-08
+prefect deployment run "photo-ingest/ingest" --param base_dir=/mnt/data/takeout/photos-2026-08