| """ |
| Shared append-only ingest harness for a ziplime PIT dataset. |
| |
| Reads `recipe.fetch(since)`, stamps `ingested_at`, drops byte-identical duplicates of |
| existing (entity_id, event_date, knowledge_date) rows, and **appends** to the Delta table. |
| It never issues UPDATE/DELETE/MERGE — append-only is the PIT invariant the linter enforces. |
| """ |
| from __future__ import annotations |
| import argparse, hashlib |
| from datetime import datetime, timezone |
| from pathlib import Path |
|
|
| import polars as pl |
| from deltalake import DeltaTable, write_deltalake |
|
|
| import recipe |
|
|
| TABLE_URI = str(Path(__file__).parent / "data" / "data_bundle" / |
| "yahoo_finance_daily_data" / "1784755946" / "data.delta") |
|
|
|
|
| def _row_hash(df: pl.DataFrame) -> pl.Series: |
| cols = [c for c in df.columns if c != "ingested_at"] |
| return df.select(cols).hash_rows().cast(pl.Utf8) |
|
|
|
|
| async def main(since: datetime) -> None: |
| fresh = await recipe.fetch(since) |
| if fresh.is_empty(): |
| print("recipe returned no rows; nothing to append") |
| return |
|
|
| fresh = fresh.with_columns( |
| pl.lit(datetime.now(timezone.utc)).alias("ingested_at"), |
| ) |
|
|
| try: |
| existing = pl.from_arrow(DeltaTable(TABLE_URI).to_pyarrow_table()) |
| seen = set(_row_hash(existing).to_list()) |
| fresh = fresh.filter(~_row_hash(fresh).is_in(seen)) |
| except Exception: |
| pass |
|
|
| if fresh.is_empty(): |
| print("no new or revised rows after dedup") |
| return |
|
|
| write_deltalake(TABLE_URI, fresh.to_arrow(), mode="append") |
| print(f"appended {len(fresh)} rows to {TABLE_URI}") |
|
|
|
|
| if __name__ == "__main__": |
| ap = argparse.ArgumentParser() |
| ap.add_argument("--since", default="2025-01-01") |
| args = ap.parse_args() |
| import asyncio |
| asyncio.run(main(datetime.fromisoformat(args.since).replace(tzinfo=timezone.utc))) |
|
|
