add SQLite triggers to auto-fix Zotero date formats

Zotero writes timestamps as 'YYYY-MM-DD HH:MM:SS' internally but
the sync engine requires ISO 8601 'YYYY-MM-DDTHH:MM:SSZ'. Six
AFTER INSERT/UPDATE triggers on the items table auto-convert
dateAdded, dateModified, and clientDateModified on every write.

Includes fix_zotero_dates.py script to apply triggers and fix
existing bad dates. Safe to run repeatedly.

dev/scripts/fix_zotero_dates.py

@@ -0,0 +1,81 @@
+"""Fix and prevent non-ISO 8601 dates in Zotero's SQLite database.
+
+Zotero internally writes timestamps as 'YYYY-MM-DD HH:MM:SS' (SQL format)
+but its sync engine requires 'YYYY-MM-DDTHH:MM:SSZ' (ISO 8601).
+This script:
+
+1. Converts all existing space-separated timestamps to ISO 8601
+2. Installs SQLite triggers that auto-convert on every INSERT/UPDATE
+
+Safe to run multiple times (triggers use CREATE IF NOT EXISTS).
+
+Usage:
+    uv run python dev/scripts/fix_zotero_dates.py
+"""
+
+from __future__ import annotations
+
+import sqlite3
+import sys
+
+DB_PATH = "zotero/data/zotero.sqlite"
+COLUMNS = ("dateAdded", "dateModified", "clientDateModified")
+
+
+def main() -> int:
+    db = sqlite3.connect(DB_PATH, timeout=10)
+    db.execute("PRAGMA wal_checkpoint(TRUNCATE)")
+
+    # Fix existing bad dates
+    for col in COLUMNS:
+        fixed = db.execute(
+            f"UPDATE items SET {col} = REPLACE({col}, ' ', 'T') || 'Z'"
+            f" WHERE {col} LIKE '____-__-__ __:__:__'"
+            f" AND {col} NOT LIKE '%T%'",
+        ).rowcount
+        if fixed:
+            print(f"Fixed {col}: {fixed}")
+
+    # Install auto-fix triggers
+    for col in COLUMNS:
+        for op in ("INSERT", "UPDATE"):
+            trigger = f"fix_{col}_{op.lower()}"
+            of_clause = f"OF {col} " if op == "UPDATE" else ""
+            db.execute(f"""
+                CREATE TRIGGER IF NOT EXISTS {trigger}
+                AFTER {op} ON items
+                FOR EACH ROW
+                WHEN NEW.{col} LIKE '____-__-__ __:__:__'
+                  AND NEW.{col} NOT LIKE '%T%'
+                BEGIN
+                    UPDATE items SET {col} = REPLACE(NEW.{col}, ' ', 'T') || 'Z'
+                    WHERE itemID = NEW.itemID;
+                END
+            """)
+
+    db.commit()
+
+    # Verify
+    triggers = [
+        r[0]
+        for r in db.execute(
+            "SELECT name FROM sqlite_master WHERE type='trigger' AND name LIKE 'fix_%'"
+        )
+    ]
+    print(f"Triggers installed: {len(triggers)}")
+    for col in COLUMNS:
+        bad = db.execute(
+            f"SELECT COUNT(*) FROM items WHERE {col} NOT LIKE '%T%'"
+        ).fetchone()[0]
+        if bad:
+            print(f"WARNING: {col} still has {bad} bad values")
+            db.close()
+            return 1
+
+    db.close()
+    print("All dates valid.")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())