Phase 5: cron entry script, soft-cap archive, run_log zero-fetch degradation

- oracle-pipeline.sh: single cron entry point (pipeline -> summarize -> archive)
- archive.py: soft-cap archival to entries_archive (preserve, not delete)
- pipeline.py: record zero-fetch (rate-limited) runs as degraded in run_log.notes
Verified: full script runs exit 0, run_log captures per-source status.

archive.py

@@ -0,0 +1,94 @@
+#!/usr/bin/env python3
+"""Oracle soft-cap archival.
+
+Bounds live `entries` growth by moving old / excess rows into
+`entries_archive` (preserving data — soft cap, not hard delete).
+Two triggers:
+  --days N : move entries not updated in N days (default 30)
+  --cap  N : if live entries exceed N, archive oldest beyond the cap (default 5000)
+Default is a real run (data moves). Use --dry-run to report only.
+"""
+
+import argparse
+import os
+import sqlite3
+import time
+
+DB = os.path.join(os.path.dirname(__file__), "oracle.db")
+
+ARCHIVE_SCHEMA = """
+CREATE TABLE IF NOT EXISTS entries_archive (
+    id INTEGER PRIMARY KEY,
+    source TEXT, source_id TEXT, url TEXT, title TEXT,
+    extracted_text TEXT, summary TEXT, category_tags TEXT,
+    signal_score REAL, raw_metadata TEXT,
+    first_seen TEXT, last_updated TEXT,
+    archived_at TEXT DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ', 'now'))
+);
+"""
+
+
+def main():
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--days", type=int, default=30, help="Archive entries not updated in N days")
+    ap.add_argument("--cap", type=int, default=5000, help="Soft cap on live entries; archive oldest beyond this")
+    ap.add_argument("--dry-run", action="store_true", help="Report only, make no changes")
+    args = ap.parse_args()
+
+    if not os.path.exists(DB):
+        print("No oracle.db — nothing to archive")
+        return
+
+    conn = sqlite3.connect(DB)
+    conn.execute(ARCHIVE_SCHEMA)
+
+    cutoff = time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime(time.time() - args.days * 86400))
+
+    cur = conn.cursor()
+    cur.execute("SELECT id, last_updated FROM entries")
+    rows = cur.fetchall()
+    n_total = len(rows)
+
+    old_ids = [r[0] for r in rows if (r[1] or "") < cutoff]
+    beyond = max(0, n_total - args.cap)
+    if beyond > 0:
+        ordered = sorted(rows, key=lambda r: r[1] or "")[:beyond]
+        cap_ids = [r[0] for r in ordered]
+    else:
+        cap_ids = []
+
+    move_ids = sorted(set(old_ids) | set(cap_ids))
+
+    if not move_ids:
+        print(f"Archive check: {n_total} live entries, none older than {args.days}d "
+              f"or beyond cap {args.cap}. Nothing to archive.")
+        conn.close()
+        return
+
+    print(f"Archive check: {n_total} live entries -> would archive {len(move_ids)} "
+          f"(old={len(old_ids)}, cap={len(cap_ids)}).")
+
+    if args.dry_run:
+        print("DRY RUN — no changes made.")
+        conn.close()
+        return
+
+    q = ",".join("?" * len(move_ids))
+    conn.execute(
+        f"""INSERT OR REPLACE INTO entries_archive
+            (id, source, source_id, url, title, extracted_text, summary,
+             category_tags, signal_score, raw_metadata, first_seen, last_updated)
+            SELECT id, source, source_id, url, title, extracted_text, summary,
+                   category_tags, signal_score, raw_metadata, first_seen, last_updated
+            FROM entries WHERE id IN ({q})""",
+        move_ids,
+    )
+    conn.execute(f"DELETE FROM entries WHERE id IN ({q})", move_ids)
+    conn.commit()
+    conn.close()
+    print(f"Archived {len(move_ids)} entries (live now {n_total - len(move_ids)}). "
+          f"Preserved in entries_archive.")
+
+
+if __name__ == "__main__":
+    main()