feat: extraction framework overhaul — extract_core shared package + SQLite state tracking

- Add extract/extract_core/ workspace package with three modules:
  - state.py: SQLite run tracking (open_state_db, start_run, end_run, get_last_cursor)
  - http.py: niquests session factory + etag normalization helpers
  - files.py: landing_path, content_hash, write_bytes_atomic (atomic gzip writes)
- State lives at {LANDING_DIR}/.state.sqlite — no extra env var needed
- SQLite chosen over DuckDB: state tracking is OLTP (row inserts/updates), not analytical
- Refactor all 4 extractors (psdonline, cftc_cot, coffee_prices, ice_stocks):
  - Replace inline boilerplate with extract_core helpers
  - Add start_run/end_run tracking to every extraction entry point
  - extract_cot_year returns int (bytes_written) instead of bool
- Update tests: assert result == 0 (not `is False`) for the return type change

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

extract/cftc_cot/pyproject.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 description = "CFTC Commitment of Traders data extractor"
 requires-python = ">=3.13"
 dependencies = [
+    "extract_core",
     "niquests>=3.14.1",
 ]
 

extract/cftc_cot/src/cftc_cot/execute.py

@@ -10,12 +10,20 @@ Landing path: LANDING_DIR/cot/{year}/{etag}.csv.gzip
 
 import logging
 import os
-import pathlib
 import sys
 from datetime import datetime
 from io import BytesIO
+from pathlib import Path
 
 import niquests
+from extract_core import (
+    end_run,
+    landing_path,
+    normalize_etag,
+    open_state_db,
+    start_run,
+    write_bytes_atomic,
+)
 
 from .normalize import find_csv_inner_filename, normalize_zipped_csv
 
@@ -27,7 +35,7 @@ logging.basicConfig(
 )
 logger = logging.getLogger("CFTC COT Extractor")
 
-LANDING_DIR = pathlib.Path(os.getenv("LANDING_DIR", "data/landing"))
+LANDING_DIR = Path(os.getenv("LANDING_DIR", "data/landing"))
 
 # CFTC publishes yearly ZIPs for the disaggregated futures-only report.
 # The file for the current year is updated each Friday at 3:30 PM ET.
@@ -52,10 +60,10 @@ def _synthetic_etag(year: int, headers: dict) -> str:
     return etag
 
 
-def extract_cot_year(year: int, http_session: niquests.Session) -> bool:
+def extract_cot_year(year: int, http_session: niquests.Session) -> int:
     """Download and store COT data for a single year.
 
-    Returns True if a new file was written, False if skipped or unavailable.
+    Returns bytes_written (0 if skipped or unavailable).
     """
     url = COT_URL_TEMPLATE.format(year=year)
     logger.info(f"Checking COT data for {year}: {url}")
@@ -63,20 +71,20 @@ def extract_cot_year(year: int, http_session: niquests.Session) -> bool:
     head = http_session.head(url, timeout=HTTP_TIMEOUT_SECONDS)
     if head.status_code == 404:
         logger.info(f"Year {year} not available (404) — skipping")
-        return False
+        return 0
     assert head.status_code == 200, (
         f"Unexpected HEAD status {head.status_code} for {url}"
     )
 
     raw_etag = head.headers.get("etag", "")
-    etag = raw_etag.replace('"', "").replace(":", "_") if raw_etag else _synthetic_etag(year, head.headers)
+    etag = normalize_etag(raw_etag) if raw_etag else _synthetic_etag(year, head.headers)
 
-    dest_dir = LANDING_DIR / "cot" / str(year)
+    dest_dir = landing_path(LANDING_DIR, "cot", str(year))
     local_file = dest_dir / f"{etag}.csv.gzip"
 
     if local_file.exists():
         logger.info(f"Year {year}: {etag}.csv.gzip already exists, skipping")
-        return False
+        return 0
 
     logger.info(f"Downloading COT data for {year}...")
     response = http_session.get(url, timeout=HTTP_TIMEOUT_SECONDS)
@@ -89,14 +97,11 @@ def extract_cot_year(year: int, http_session: niquests.Session) -> bool:
     inner_filename = find_csv_inner_filename(BytesIO(response.content))
     normalized = normalize_zipped_csv(zip_buffer, inner_filename)
 
-    dest_dir.mkdir(parents=True, exist_ok=True)
+    bytes_written = write_bytes_atomic(local_file, normalized.read())
-    local_file.write_bytes(normalized.read())
-
-    assert local_file.exists(), f"File was not written: {local_file}"
     assert local_file.stat().st_size > 0, f"Written file is empty: {local_file}"
 
-    logger.info(f"Stored {local_file} ({local_file.stat().st_size:,} bytes)")
+    logger.info(f"Stored {local_file} ({bytes_written:,} bytes)")
-    return True
+    return bytes_written
 
 
 def extract_cot_dataset():
@@ -113,16 +118,36 @@ def extract_cot_dataset():
         f"Year range {len(years)} exceeds MAX_YEARS={MAX_YEARS}"
     )
 
-    new_count = 0
+    conn = open_state_db(LANDING_DIR)
+    run_id = start_run(conn, "cftc_cot")
+    files_written = 0
+    files_skipped = 0
+    bytes_written_total = 0
+    try:
         with niquests.Session() as session:
             for year in years:
                 try:
-                if extract_cot_year(year, session):
+                    result = extract_cot_year(year, session)
-                    new_count += 1
+                    if result > 0:
+                        files_written += 1
+                        bytes_written_total += result
+                    else:
+                        files_skipped += 1
                 except Exception:
                     logger.exception(f"Failed to extract COT data for {year}, continuing")
 
-    logger.info(f"COT extraction complete: {new_count} new file(s) downloaded")
+        logger.info(f"COT extraction complete: {files_written} new file(s) downloaded")
+        end_run(
+            conn, run_id, status="success",
+            files_written=files_written, files_skipped=files_skipped,
+            bytes_written=bytes_written_total,
+            cursor_value=str(current_year),
+        )
+    except Exception as e:
+        end_run(conn, run_id, status="failed", error_message=str(e))
+        raise
+    finally:
+        conn.close()
 
 
 if __name__ == "__main__":

extract/coffee_prices/pyproject.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 description = "KC=F Coffee C futures price extractor"
 requires-python = ">=3.13"
 dependencies = [
+    "extract_core",
     "yfinance>=0.2.55",
 ]
 

extract/coffee_prices/src/coffee_prices/execute.py

@@ -8,14 +8,15 @@ Landing path: LANDING_DIR/prices/coffee_kc/{hash8}.csv.gzip
 """
 
 import gzip
-import hashlib
 import io
 import logging
 import os
-import pathlib
 import sys
+from pathlib import Path
 
 import yfinance as yf
+from extract_core import content_hash, end_run, landing_path, open_state_db, start_run
+from extract_core import write_bytes_atomic
 
 logging.basicConfig(
     level=logging.INFO,
@@ -25,7 +26,7 @@ logging.basicConfig(
 )
 logger = logging.getLogger("Coffee Prices Extractor")
 
-LANDING_DIR = pathlib.Path(os.getenv("LANDING_DIR", "data/landing"))
+LANDING_DIR = Path(os.getenv("LANDING_DIR", "data/landing"))
 TICKER = "KC=F"
 DEST_SUBDIR = "prices/coffee_kc"
 
@@ -40,6 +41,9 @@ def extract_coffee_prices() -> None:
     On first run downloads full history (period='max'). On subsequent runs
     the hash matches if no new trading days have closed since last run.
     """
+    conn = open_state_db(LANDING_DIR)
+    run_id = start_run(conn, "coffee_prices")
+    try:
         logger.info(f"Downloading {TICKER} daily OHLCV from Yahoo Finance...")
 
         ticker = yf.Ticker(TICKER)
@@ -64,28 +68,27 @@ def extract_coffee_prices() -> None:
 
         assert len(csv_bytes) > 0, "CSV serialization produced empty output"
 
-    # Hash-based idempotency key (first 8 hex chars of SHA256)
+        etag = content_hash(csv_bytes)
-    sha256 = hashlib.sha256(csv_bytes).hexdigest()
+        dest_dir = landing_path(LANDING_DIR, DEST_SUBDIR)
-    etag = sha256[:8]
-
-    dest_dir = LANDING_DIR / DEST_SUBDIR
         local_file = dest_dir / f"{etag}.csv.gzip"
 
         if local_file.exists():
             logger.info(f"File {local_file.name} already exists — no new data, skipping")
+            end_run(conn, run_id, status="success", files_skipped=1)
             return
 
-    # Compress and write
-    dest_dir.mkdir(parents=True, exist_ok=True)
         compressed = gzip.compress(csv_bytes)
-    local_file.write_bytes(compressed)
+        bytes_written = write_bytes_atomic(local_file, compressed)
-
-    assert local_file.exists(), f"File was not written: {local_file}"
-    assert local_file.stat().st_size > 0, f"Written file is empty: {local_file}"
 
         logger.info(
-        f"Stored {local_file} ({local_file.stat().st_size:,} bytes, {len(df):,} rows)"
+            f"Stored {local_file} ({bytes_written:,} bytes, {len(df):,} rows)"
         )
+        end_run(conn, run_id, status="success", files_written=1, bytes_written=bytes_written)
+    except Exception as e:
+        end_run(conn, run_id, status="failed", error_message=str(e))
+        raise
+    finally:
+        conn.close()
 
 
 if __name__ == "__main__":

extract/extract_core/pyproject.toml

@@ -0,0 +1,15 @@
+[project]
+name = "extract_core"
+version = "0.1.0"
+description = "Shared extraction utilities: SQLite state tracking, HTTP helpers, file I/O"
+requires-python = ">=3.13"
+dependencies = [
+    "niquests>=3.14.1",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/extract_core"]

extract/extract_core/src/extract_core/__init__.py

@@ -0,0 +1,17 @@
+from .files import content_hash, landing_path, write_bytes_atomic
+from .http import create_session, head_etag, normalize_etag
+from .state import end_run, get_last_cursor, get_recent_runs, open_state_db, start_run
+
+__all__ = [
+    "open_state_db",
+    "start_run",
+    "end_run",
+    "get_last_cursor",
+    "get_recent_runs",
+    "create_session",
+    "head_etag",
+    "normalize_etag",
+    "landing_path",
+    "content_hash",
+    "write_bytes_atomic",
+]

extract/extract_core/src/extract_core/files.py

@@ -0,0 +1,53 @@
+"""Landing zone file I/O helpers for extraction pipelines."""
+
+import hashlib
+from pathlib import Path
+
+
+def landing_path(landing_dir: str | Path, *parts: str) -> Path:
+    """Return path to a subdirectory of landing_dir, creating it if absent.
+
+    Example:
+        dest_dir = landing_path("data/landing", "psd", "2025", "07")
+        # Returns Path("data/landing/psd/2025/07"), all directories created.
+
+    Use this instead of manually calling mkdir — it makes the intent clear
+    and ensures the directory always exists before the caller writes to it.
+    """
+    assert landing_dir, "landing_dir must not be empty"
+    path = Path(landing_dir).joinpath(*parts)
+    path.mkdir(parents=True, exist_ok=True)
+    return path
+
+
+def content_hash(data: bytes, prefix_bytes: int = 8) -> str:
+    """Return the first prefix_bytes hex chars of the SHA256 digest of data.
+
+    Used as a short idempotency key for content-addressed filenames. Two runs
+    that produce identical data will produce the same hash, so the file already
+    existing on disk is proof the content is unchanged.
+
+    prefix_bytes=8 gives 32-bit collision resistance — sufficient for a few
+    thousand files per extractor. Increase to 16 for very high-volume sources.
+    """
+    assert data, "data must not be empty"
+    assert 1 <= prefix_bytes <= 64, f"prefix_bytes must be 1-64, got {prefix_bytes}"
+    return hashlib.sha256(data).hexdigest()[:prefix_bytes]
+
+
+def write_bytes_atomic(path: Path, data: bytes) -> int:
+    """Write data to path atomically via a .tmp sibling file.
+
+    Writes to {path}.tmp first, then renames to path. On Linux, rename() is
+    atomic when src and dst are on the same filesystem — a reader never sees
+    a partial file. Returns the number of bytes written.
+
+    Callers are responsible for compression (e.g. gzip.compress) before calling
+    this function.
+    """
+    assert data, "data must not be empty"
+    tmp = path.with_suffix(path.suffix + ".tmp")
+    tmp.write_bytes(data)
+    tmp.rename(path)
+    assert path.exists(), f"File was not written: {path}"
+    return len(data)

extract/extract_core/src/extract_core/http.py

@@ -0,0 +1,43 @@
+"""HTTP session factory and etag helpers for extraction pipelines."""
+
+import niquests
+
+
+def create_session(timeout_seconds: int = 60, max_retries: int = 3) -> niquests.Session:
+    """Return a new niquests Session.
+
+    timeout_seconds is stored as an attribute so callers that need a consistent
+    timeout can reference it via session.timeout_seconds.
+    """
+    assert timeout_seconds > 0, f"timeout_seconds must be positive, got {timeout_seconds}"
+    assert max_retries >= 0, f"max_retries must be non-negative, got {max_retries}"
+    session = niquests.Session()
+    session.timeout_seconds = timeout_seconds  # type: ignore[attr-defined]
+    return session
+
+
+def normalize_etag(raw: str) -> str:
+    """Normalize an HTTP etag for use as a filename component.
+
+    Strips surrounding quotes and replaces colons with underscores so the
+    result is safe as a filename on all platforms.
+
+    Example: '"abc:def"' → 'abc_def'
+    """
+    assert raw, "raw etag must not be empty"
+    return raw.strip().strip('"').replace(":", "_")
+
+
+def head_etag(session: niquests.Session, url: str, timeout_seconds: int = 60) -> str | None:
+    """Send a HEAD request and return the normalized etag, or None if absent.
+
+    Returns None (not raises) when the server omits the etag header, so callers
+    can fall back to a synthetic key (e.g. content-length + last-modified).
+    """
+    assert url, "url must not be empty"
+    assert timeout_seconds > 0, f"timeout_seconds must be positive, got {timeout_seconds}"
+    response = session.head(url, timeout=timeout_seconds)
+    raw = response.headers.get("etag", "")
+    if not raw:
+        return None
+    return normalize_etag(raw)

extract/extract_core/src/extract_core/state.py

@@ -0,0 +1,122 @@
+"""SQLite-backed extraction run state.
+
+State table lives at {LANDING_DIR}/.state.sqlite — derived from LANDING_DIR,
+no extra env var required. SQLite is used (not DuckDB) because state tracking
+is a transactional workload: single-row inserts and point-lookup updates, not
+analytical scans. WAL mode allows concurrent readers while a run is in progress.
+
+Schema is generic: extractor is a free-text name, cursor_value is a TEXT field
+that can hold any cursor type (date string, etag, page number, or JSON for
+multi-dimensional cursors). The schema should never need changing — add new
+extractor names by just using them.
+"""
+
+import sqlite3
+from pathlib import Path
+
+_CREATE_TABLE_SQL = """
+CREATE TABLE IF NOT EXISTS extraction_runs (
+    run_id        INTEGER PRIMARY KEY AUTOINCREMENT,
+    extractor     TEXT NOT NULL,
+    started_at    TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ', 'now')),
+    finished_at   TEXT,
+    status        TEXT NOT NULL DEFAULT 'running',
+    files_written INTEGER DEFAULT 0,
+    files_skipped INTEGER DEFAULT 0,
+    bytes_written INTEGER DEFAULT 0,
+    cursor_value  TEXT,
+    error_message TEXT
+)
+"""
+
+
+def open_state_db(landing_dir: str | Path) -> sqlite3.Connection:
+    """Open (or create) the state DB at {landing_dir}/.state.sqlite.
+
+    Enables WAL mode so concurrent readers (e.g. monitoring scripts) can query
+    the DB while an extraction run is in progress. Caller must close when done.
+    """
+    assert landing_dir, "landing_dir must not be empty"
+    db_path = Path(landing_dir) / ".state.sqlite"
+    db_path.parent.mkdir(parents=True, exist_ok=True)
+    conn = sqlite3.connect(str(db_path))
+    conn.row_factory = sqlite3.Row
+    conn.execute("PRAGMA journal_mode=WAL")
+    conn.execute(_CREATE_TABLE_SQL)
+    conn.commit()
+    return conn
+
+
+def start_run(conn: sqlite3.Connection, extractor: str) -> int:
+    """Insert a 'running' row for extractor. Returns the new run_id."""
+    assert extractor, "extractor name must not be empty"
+    cur = conn.execute(
+        "INSERT INTO extraction_runs (extractor, status) VALUES (?, 'running')",
+        (extractor,),
+    )
+    conn.commit()
+    assert cur.lastrowid is not None, "INSERT did not return a row ID"
+    return cur.lastrowid
+
+
+def end_run(
+    conn: sqlite3.Connection,
+    run_id: int,
+    *,
+    status: str,
+    files_written: int = 0,
+    files_skipped: int = 0,
+    bytes_written: int = 0,
+    cursor_value: str | None = None,
+    error_message: str | None = None,
+) -> None:
+    """Update the run row to its final state (success or failed)."""
+    assert status in ("success", "failed"), f"status must be 'success' or 'failed', got {status!r}"
+    assert run_id > 0, f"run_id must be positive, got {run_id}"
+    assert files_written >= 0, f"files_written must be non-negative, got {files_written}"
+    assert files_skipped >= 0, f"files_skipped must be non-negative, got {files_skipped}"
+    assert bytes_written >= 0, f"bytes_written must be non-negative, got {bytes_written}"
+    conn.execute(
+        """
+        UPDATE extraction_runs
+        SET finished_at   = strftime('%Y-%m-%dT%H:%M:%SZ', 'now'),
+            status        = ?,
+            files_written = ?,
+            files_skipped = ?,
+            bytes_written = ?,
+            cursor_value  = ?,
+            error_message = ?
+        WHERE run_id = ?
+        """,
+        (status, files_written, files_skipped, bytes_written, cursor_value, error_message, run_id),
+    )
+    conn.commit()
+
+
+def get_last_cursor(conn: sqlite3.Connection, extractor: str) -> str | None:
+    """Return the cursor_value from the most recent successful run, or None."""
+    row = conn.execute(
+        """
+        SELECT cursor_value FROM extraction_runs
+        WHERE extractor = ? AND status = 'success' AND cursor_value IS NOT NULL
+        ORDER BY run_id DESC
+        LIMIT 1
+        """,
+        (extractor,),
+    ).fetchone()
+    return row["cursor_value"] if row else None
+
+
+def get_recent_runs(conn: sqlite3.Connection, extractor: str, limit: int = 10) -> list[dict]:
+    """Return the most recent runs for an extractor, newest first."""
+    assert limit > 0, f"limit must be positive, got {limit}"
+    rows = conn.execute(
+        """
+        SELECT * FROM extraction_runs
+        WHERE extractor = ?
+        ORDER BY run_id DESC
+        LIMIT ?
+        """,
+        (extractor, limit),
+    ).fetchall()
+    return [dict(r) for r in rows]

extract/ice_stocks/pyproject.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 description = "ICE certified warehouse stocks extractor"
 requires-python = ">=3.13"
 dependencies = [
+    "extract_core",
     "niquests>=3.14.1",
     "xlrd>=2.0.1",
 ]

extract/ice_stocks/src/ice_stocks/execute.py

@@ -20,16 +20,23 @@ CSV schemas:
 
 import csv
 import gzip
-import hashlib
 import io
 import logging
 import os
-import pathlib
 import sys
 from datetime import datetime
+from pathlib import Path
 
 import niquests
 import xlrd
+from extract_core import (
+    content_hash,
+    end_run,
+    landing_path,
+    open_state_db,
+    start_run,
+    write_bytes_atomic,
+)
 
 from ice_stocks.ice_api import find_all_reports, find_latest_report
 from ice_stocks.xls_parse import OLE2_MAGIC, detect_file_format, xls_to_rows
@@ -42,7 +49,7 @@ logging.basicConfig(
 )
 logger = logging.getLogger("ICE Stocks Extractor")
 
-LANDING_DIR = pathlib.Path(os.getenv("LANDING_DIR", "data/landing"))
+LANDING_DIR = Path(os.getenv("LANDING_DIR", "data/landing"))
 
 # ── ice_stocks (daily rolling) ──────────────────────────────────────────────
 DEST_SUBDIR = "ice_stocks"
@@ -105,31 +112,30 @@ HISTORICAL_PORT_COLS = [
 
 # ── shared helpers ───────────────────────────────────────────────────────────
 
-def _write_landing_file(canonical_csv: bytes, dest_subdir: str, date_label: str) -> None:
+def _write_landing_file(canonical_csv: bytes, dest_subdir: str, date_label: str) -> int:
-    """SHA256-hash canonical_csv, skip if exists, else gzip and write."""
+    """SHA256-hash canonical_csv, skip if exists, else gzip and write atomically.
+
+    Returns bytes_written (0 if skipped).
+    """
     assert canonical_csv, "canonical_csv must not be empty"
     assert dest_subdir, "dest_subdir must not be empty"
     assert date_label, "date_label must not be empty"
 
-    sha256 = hashlib.sha256(canonical_csv).hexdigest()
+    etag = content_hash(canonical_csv)
-    etag = sha256[:8]
     year = date_label[:4]
 
-    dest_dir = LANDING_DIR / dest_subdir / year
+    dest_dir = landing_path(LANDING_DIR, dest_subdir, year)
     local_file = dest_dir / f"{date_label}_{etag}.csv.gzip"
 
     if local_file.exists():
         logger.info(f"File {local_file.name} already exists — content unchanged, skipping")
-        return
+        return 0
 
-    dest_dir.mkdir(parents=True, exist_ok=True)
     compressed = gzip.compress(canonical_csv)
-    local_file.write_bytes(compressed)
+    bytes_written = write_bytes_atomic(local_file, compressed)
 
-    assert local_file.exists(), f"File was not written: {local_file}"
+    logger.info(f"Stored {local_file} ({bytes_written:,} bytes)")
-    assert local_file.stat().st_size > 0, f"Written file is empty: {local_file}"
+    return bytes_written
-
-    logger.info(f"Stored {local_file} ({local_file.stat().st_size:,} bytes)")
 
 
 def _build_csv_bytes(fieldnames: list[str], rows: list[dict]) -> bytes:
@@ -243,6 +249,9 @@ def extract_ice_stocks() -> None:
     discovery to find the latest 'Daily Warehouse Stocks' report.
     Idempotent: skips if content hash already on disk.
     """
+    conn = open_state_db(LANDING_DIR)
+    run_id = start_run(conn, "ice_stocks")
+    try:
         with niquests.Session() as session:
             logger.info(f"Trying ICE rolling CSV: {ICE_ROLLING_CSV_URL}")
             try:
@@ -258,16 +267,19 @@ def extract_ice_stocks() -> None:
                 report = find_latest_report(session, ICE_STOCKS_LABEL)
                 if not report:
                     logger.error("ICE API: no 'Daily Warehouse Stocks' report found")
+                    end_run(conn, run_id, status="failed", error_message="No report found via API")
                     return
                 logger.info(f"Found report via API: {report['download_label']} ({report['publish_date']})")
                 try:
                     response = session.get(report["download_url"], timeout=HTTP_TIMEOUT_SECONDS)
                 except Exception as e:
                     logger.error(f"Failed to download report from API URL: {e}")
+                    end_run(conn, run_id, status="failed", error_message=str(e))
                     return
 
             if response.status_code != 200:
                 logger.error(f"Unexpected status {response.status_code}")
+                end_run(conn, run_id, status="failed", error_message=f"HTTP {response.status_code}")
                 return
 
             assert len(response.content) > 0, "Downloaded empty file from ICE"
@@ -280,10 +292,23 @@ def extract_ice_stocks() -> None:
 
         if not canonical_csv:
             logger.warning("ICE stocks parsed to 0 rows — check column mapping or XLS structure")
+            end_run(conn, run_id, status="failed", error_message="Parsed 0 rows")
             return
 
         today = datetime.now().strftime("%Y-%m-%d")
-    _write_landing_file(canonical_csv, DEST_SUBDIR, today)
+        bytes_written = _write_landing_file(canonical_csv, DEST_SUBDIR, today)
+        end_run(
+            conn, run_id, status="success",
+            files_written=1 if bytes_written > 0 else 0,
+            files_skipped=1 if bytes_written == 0 else 0,
+            bytes_written=bytes_written,
+            cursor_value=today,
+        )
+    except Exception as e:
+        end_run(conn, run_id, status="failed", error_message=str(e))
+        raise
+    finally:
+        conn.close()
 
 
 # ── ice_aging (monthly aging report) ────────────────────────────────────────
@@ -309,11 +334,15 @@ def extract_ice_aging() -> None:
     Monthly report: stock quantities by age bucket × port.
     Idempotent: skips if content hash already on disk.
     """
+    conn = open_state_db(LANDING_DIR)
+    run_id = start_run(conn, "ice_aging")
+    try:
         with niquests.Session() as session:
             logger.info("Fetching latest ICE Aging Report via API")
             report = find_latest_report(session, ICE_AGING_LABEL)
             if not report:
                 logger.error(f"ICE API: no report matching {ICE_AGING_LABEL!r}")
+                end_run(conn, run_id, status="failed", error_message="No aging report found via API")
                 return
 
             logger.info(f"Downloading: {report['download_label']} ({report['publish_date']})")
@@ -321,6 +350,7 @@ def extract_ice_aging() -> None:
                 response = session.get(report["download_url"], timeout=HTTP_TIMEOUT_SECONDS)
             except Exception as e:
                 logger.error(f"Failed to download aging report: {e}")
+                end_run(conn, run_id, status="failed", error_message=str(e))
                 return
 
             assert response.status_code == 200, f"HTTP {response.status_code}"
@@ -330,7 +360,9 @@ def extract_ice_aging() -> None:
 
         report_date = _parse_aging_date(str(rows[0][0]) if rows else "")
         if not report_date:
-        logger.error(f"Could not parse aging report date from row 0: {rows[0] if rows else '(empty)'!r}")
+            msg = f"Could not parse aging report date from row 0: {rows[0] if rows else '(empty)'!r}"
+            logger.error(msg)
+            end_run(conn, run_id, status="failed", error_message=msg)
             return
 
         # Row 3+ are data rows; stop at row labelled "Total"
@@ -364,10 +396,23 @@ def extract_ice_aging() -> None:
 
         if not data_rows:
             logger.warning("Aging report parsed to 0 data rows")
+            end_run(conn, run_id, status="failed", error_message="Parsed 0 data rows")
             return
 
         canonical_csv = _build_csv_bytes(fieldnames, data_rows)
-    _write_landing_file(canonical_csv, AGING_DEST_SUBDIR, report_date)
+        bytes_written = _write_landing_file(canonical_csv, AGING_DEST_SUBDIR, report_date)
+        end_run(
+            conn, run_id, status="success",
+            files_written=1 if bytes_written > 0 else 0,
+            files_skipped=1 if bytes_written == 0 else 0,
+            bytes_written=bytes_written,
+            cursor_value=report_date,
+        )
+    except Exception as e:
+        end_run(conn, run_id, status="failed", error_message=str(e))
+        raise
+    finally:
+        conn.close()
 
 
 # ── ice_stocks_by_port (historical) ─────────────────────────────────────────
@@ -387,6 +432,9 @@ def extract_ice_historical() -> None:
     Static URL updated monthly. Covers Nov 1996 to present.
     Idempotent: skips if content hash already on disk.
     """
+    conn = open_state_db(LANDING_DIR)
+    run_id = start_run(conn, "ice_historical")
+    try:
         logger.info(f"Downloading ICE historical by-port XLS: {ICE_HISTORICAL_URL}")
 
         with niquests.Session() as session:
@@ -394,6 +442,7 @@ def extract_ice_historical() -> None:
                 response = session.get(ICE_HISTORICAL_URL, timeout=HISTORICAL_HTTP_TIMEOUT_SECONDS)
             except Exception as e:
                 logger.error(f"Failed to download historical XLS: {e}")
+                end_run(conn, run_id, status="failed", error_message=str(e))
                 return
 
             assert response.status_code == 200, f"HTTP {response.status_code}"
@@ -439,11 +488,24 @@ def extract_ice_historical() -> None:
 
         if not data_rows:
             logger.warning("Historical XLS parsed to 0 data rows")
+            end_run(conn, run_id, status="failed", error_message="Parsed 0 data rows")
             return
 
         canonical_csv = _build_csv_bytes(fieldnames, data_rows)
         today = datetime.now().strftime("%Y-%m-%d")
-    _write_landing_file(canonical_csv, HISTORICAL_DEST_SUBDIR, today)
+        bytes_written = _write_landing_file(canonical_csv, HISTORICAL_DEST_SUBDIR, today)
+        end_run(
+            conn, run_id, status="success",
+            files_written=1 if bytes_written > 0 else 0,
+            files_skipped=1 if bytes_written == 0 else 0,
+            bytes_written=bytes_written,
+            cursor_value=today,
+        )
+    except Exception as e:
+        end_run(conn, run_id, status="failed", error_message=str(e))
+        raise
+    finally:
+        conn.close()
 
 
 def extract_ice_stocks_backfill(max_pages: int = 3) -> None:
@@ -458,17 +520,22 @@ def extract_ice_stocks_backfill(max_pages: int = 3) -> None:
     """
     assert max_pages > 0, f"max_pages must be positive, got {max_pages}"
 
+    conn = open_state_db(LANDING_DIR)
+    run_id = start_run(conn, "ice_stocks_backfill")
+    files_written = 0
+    files_skipped = 0
+    bytes_written_total = 0
+    try:
         with niquests.Session() as session:
             logger.info(f"Fetching all available Daily Warehouse Stocks reports (max {max_pages} pages)...")
             reports = find_all_reports(session, ICE_STOCKS_LABEL, max_pages=max_pages)
 
             if not reports:
                 logger.error("ICE API: no 'Daily Warehouse Stocks' reports found")
+                end_run(conn, run_id, status="failed", error_message="No reports found via API")
                 return
 
             logger.info(f"Found {len(reports)} reports: {reports[-1]['publish_date']} → {reports[0]['publish_date']}")
-        downloaded = 0
-        skipped = 0
 
             for report in reports:
                 publish_date = report["publish_date"]
@@ -492,16 +559,24 @@ def extract_ice_stocks_backfill(max_pages: int = 3) -> None:
                     logger.warning(f"Parsed 0 rows for {publish_date} — skipping")
                     continue
 
-            # Use the report's publish date as the file date label
+                result = _write_landing_file(canonical_csv, DEST_SUBDIR, publish_date)
-            file_count_before = sum(1 for _ in (LANDING_DIR / DEST_SUBDIR).rglob("*.csv.gzip"))
+                if result > 0:
-            _write_landing_file(canonical_csv, DEST_SUBDIR, publish_date)
+                    files_written += 1
-            file_count_after = sum(1 for _ in (LANDING_DIR / DEST_SUBDIR).rglob("*.csv.gzip"))
+                    bytes_written_total += result
-            if file_count_after > file_count_before:
-                downloaded += 1
                 else:
-                skipped += 1
+                    files_skipped += 1
 
-    logger.info(f"Backfill complete: {downloaded} new files downloaded, {skipped} already existed")
+        logger.info(f"Backfill complete: {files_written} new files downloaded, {files_skipped} already existed")
+        end_run(
+            conn, run_id, status="success",
+            files_written=files_written, files_skipped=files_skipped,
+            bytes_written=bytes_written_total,
+        )
+    except Exception as e:
+        end_run(conn, run_id, status="failed", error_message=str(e))
+        raise
+    finally:
+        conn.close()
 
 
 def extract_ice_all() -> None:

extract/psdonline/pyproject.toml

@@ -8,6 +8,7 @@ authors = [
 requires-python = ">=3.13"
 
 dependencies = [
+    "extract_core",
     "niquests>=3.14.1",
 ]
 [project.scripts]

extract/psdonline/src/psdonline/execute.py

@@ -1,12 +1,14 @@
 from .normalize import normalize_zipped_csv
 import logging
 import os
-import pathlib
 import sys
 from datetime import datetime
 from io import BytesIO
+from pathlib import Path
 
 import niquests
+from extract_core import end_run, landing_path, normalize_etag, open_state_db, start_run
+from extract_core import write_bytes_atomic
 
 logging.basicConfig(
     level=logging.INFO,
@@ -16,7 +18,7 @@ logging.basicConfig(
 )
 logger = logging.getLogger("PSDOnline Extractor")
 
-LANDING_DIR = pathlib.Path(os.getenv("LANDING_DIR", "data/landing"))
+LANDING_DIR = Path(os.getenv("LANDING_DIR", "data/landing"))
 LANDING_DIR.mkdir(parents=True, exist_ok=True)
 logger.info(f"Landing dir: {LANDING_DIR}")
 
@@ -27,39 +29,48 @@ FIRST_MONTH = 8
 HTTP_TIMEOUT_SECONDS = 60
 
 
-def extract_psd_file(url: str, year: int, month: int, http_session: niquests.Session):
+def extract_psd_file(url: str, year: int, month: int, http_session: niquests.Session) -> int:
-    """Extract PSD file to local year/month subdirectory."""
+    """Extract PSD file to local year/month subdirectory.
+
+    Returns bytes_written (0 if the file already existed and was skipped).
+    """
     logger.info(f"Requesting file {url} ...")
 
     response = http_session.head(url, timeout=HTTP_TIMEOUT_SECONDS)
     if response.status_code == 404:
         logger.error("File doesn't exist on server, received status code 404 Not Found")
-        return
+        return 0
     elif response.status_code != 200:
         logger.error(f"Status code not ok, STATUS={response.status_code}")
-        return
+        return 0
 
-    etag = response.headers.get("etag", "").replace('"', "").replace(":", "_")
+    raw_etag = response.headers.get("etag", "")
-    assert etag, "USDA response missing etag header"
+    assert raw_etag, "USDA response missing etag header"
+    etag = normalize_etag(raw_etag)
 
-    extract_to_path = LANDING_DIR / "psd" / str(year) / f"{month:02d}"
+    dest_dir = landing_path(LANDING_DIR, "psd", str(year), f"{month:02d}")
-    local_file = extract_to_path / f"{etag}.csv.gzip"
+    local_file = dest_dir / f"{etag}.csv.gzip"
     if local_file.exists():
         logger.info(f"File {etag}.csv.gzip already exists locally, skipping")
-        return
+        return 0
 
     response = http_session.get(url, timeout=HTTP_TIMEOUT_SECONDS)
     logger.info(f"Storing file to {local_file}")
-    extract_to_path.mkdir(parents=True, exist_ok=True)
     normalized_content = normalize_zipped_csv(BytesIO(response.content))
-    local_file.write_bytes(normalized_content.read())
+    bytes_written = write_bytes_atomic(local_file, normalized_content.read())
-    assert local_file.exists(), f"File was not written: {local_file}"
     logger.info("Download complete")
+    return bytes_written
 
 
 def extract_psd_dataset():
+    conn = open_state_db(LANDING_DIR)
+    run_id = start_run(conn, "psdonline")
+    files_written = 0
+    files_skipped = 0
+    bytes_written = 0
+    cursor_value = None
+    try:
         today = datetime.now()
-
         with niquests.Session() as session:
             for months_back in range(4):
                 year = today.year
@@ -74,15 +85,32 @@ def extract_psd_dataset():
                 response = session.head(url, timeout=HTTP_TIMEOUT_SECONDS)
                 if response.status_code == 200:
                     logger.info(f"Found latest data at {year}-{month:02d}")
-                extract_psd_file(url=url, year=year, month=month, http_session=session)
+                    result = extract_psd_file(url=url, year=year, month=month, http_session=session)
-                return
+                    if result > 0:
+                        files_written = 1
+                        bytes_written = result
+                    else:
+                        files_skipped = 1
+                    cursor_value = f"{year}-{month:02d}"
+                    break
                 elif response.status_code == 404:
                     logger.info(f"Month {year}-{month:02d} not found, trying earlier...")
                 else:
                     logger.warning(f"Unexpected status code {response.status_code} for {year}-{month:02d}")
-
+            else:
                 logger.error("Could not find any available data in the last 4 months")
 
+        end_run(
+            conn, run_id, status="success",
+            files_written=files_written, files_skipped=files_skipped,
+            bytes_written=bytes_written, cursor_value=cursor_value,
+        )
+    except Exception as e:
+        end_run(conn, run_id, status="failed", error_message=str(e))
+        raise
+    finally:
+        conn.close()
+
 
 if __name__ == "__main__":
     extract_psd_dataset()

pyproject.toml

@@ -40,6 +40,7 @@ dev = [
 ]
 
 [tool.uv.sources]
+extract_core = {workspace = true }
 psdonline = {workspace = true }
 sqlmesh_materia = {workspace = true }
 cftc_cot = {workspace = true }

tests/test_cot_extraction.py

@@ -123,7 +123,7 @@ def test_extract_cot_year_skips_existing_file(tmp_path, monkeypatch):
 
     result = cot_execute.extract_cot_year(2024, mock_session)
 
-    assert result is False
+    assert result == 0
     mock_session.get.assert_not_called()  # No download should occur
 
 
@@ -143,5 +143,5 @@ def test_extract_cot_year_returns_false_on_404(tmp_path, monkeypatch):
 
     result = cot_execute.extract_cot_year(2006, mock_session)
 
-    assert result is False
+    assert result == 0
     mock_session.get.assert_not_called()

uv.lock

@@ -11,6 +11,7 @@ members = [
     "beanflows",
     "cftc-cot",
     "coffee-prices",
+    "extract-core",
     "ice-stocks",
     "materia",
     "psdonline",
@@ -365,11 +366,15 @@ name = "cftc-cot"
 version = "0.1.0"
 source = { editable = "extract/cftc_cot" }
 dependencies = [
+    { name = "extract-core" },
     { name = "niquests" },
 ]
 
 [package.metadata]
-requires-dist = [{ name = "niquests", specifier = ">=3.14.1" }]
+requires-dist = [
+    { name = "extract-core", editable = "extract/extract_core" },
+    { name = "niquests", specifier = ">=3.14.1" },
+]
 
 [[package]]
 name = "charset-normalizer"
@@ -438,11 +443,15 @@ name = "coffee-prices"
 version = "0.1.0"
 source = { editable = "extract/coffee_prices" }
 dependencies = [
+    { name = "extract-core" },
     { name = "yfinance" },
 ]
 
 [package.metadata]
-requires-dist = [{ name = "yfinance", specifier = ">=0.2.55" }]
+requires-dist = [
+    { name = "extract-core", editable = "extract/extract_core" },
+    { name = "yfinance", specifier = ">=0.2.55" },
+]
 
 [[package]]
 name = "colorama"
@@ -740,6 +749,17 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/c1/ea/53f2148663b321f21b5a606bd5f191517cf40b7072c0497d3c92c4a13b1e/executing-2.2.1-py2.py3-none-any.whl", hash = "sha256:760643d3452b4d777d295bb167ccc74c64a81df23fb5e08eff250c425a4b2017", size = 28317, upload-time = "2025-09-01T09:48:08.5Z" },
 ]
 
+[[package]]
+name = "extract-core"
+version = "0.1.0"
+source = { editable = "extract/extract_core" }
+dependencies = [
+    { name = "niquests" },
+]
+
+[package.metadata]
+requires-dist = [{ name = "niquests", specifier = ">=3.14.1" }]
+
 [[package]]
 name = "fakeredis"
 version = "2.34.0"
@@ -1059,12 +1079,14 @@ name = "ice-stocks"
 version = "0.1.0"
 source = { editable = "extract/ice_stocks" }
 dependencies = [
+    { name = "extract-core" },
     { name = "niquests" },
     { name = "xlrd" },
 ]
 
 [package.metadata]
 requires-dist = [
+    { name = "extract-core", editable = "extract/extract_core" },
     { name = "niquests", specifier = ">=3.14.1" },
     { name = "xlrd", specifier = ">=2.0.1" },
 ]
@@ -2067,11 +2089,15 @@ name = "psdonline"
 version = "0.1.0"
 source = { editable = "extract/psdonline" }
 dependencies = [
+    { name = "extract-core" },
     { name = "niquests" },
 ]
 
 [package.metadata]
-requires-dist = [{ name = "niquests", specifier = ">=3.14.1" }]
+requires-dist = [
+    { name = "extract-core", editable = "extract/extract_core" },
+    { name = "niquests", specifier = ">=3.14.1" },
+]
 
 [[package]]
 name = "psutil"