sync errors

db.py

@@ -68,6 +68,12 @@ def init_db() -> None:
                 status       TEXT DEFAULT 'running',
                 error_msg    TEXT
             );
+
+            CREATE TABLE IF NOT EXISTS remote_zip_cache (
+                remote_path TEXT PRIMARY KEY,
+                file_size   INTEGER NOT NULL,
+                cached_at   TEXT NOT NULL
+            );
         """)
 
 
@@ -110,6 +116,39 @@ def get_all_processed_paths() -> set[str]:
     return {row["remote_path"] for row in rows}
 
 
+# --- Remote zip cache ---
+
+def get_remote_zip_cache() -> list[tuple[str, int]]:
+    """Return cached (remote_path, file_size) tuples."""
+    with get_db() as conn:
+        rows = conn.execute("SELECT remote_path, file_size FROM remote_zip_cache").fetchall()
+    return [(row["remote_path"], row["file_size"]) for row in rows]
+
+
+def upsert_remote_zip_cache(zips: list[tuple[str, int]]) -> None:
+    """Bulk-insert or replace cache entries. zips is a list of (remote_path, file_size)."""
+    now = _now()
+    with get_db() as conn:
+        conn.executemany(
+            "INSERT INTO remote_zip_cache (remote_path, file_size, cached_at) VALUES (?,?,?)"
+            " ON CONFLICT(remote_path) DO UPDATE SET file_size=excluded.file_size, cached_at=excluded.cached_at",
+            [(path, size, now) for path, size in zips],
+        )
+
+
+def get_remote_cache_info() -> dict:
+    with get_db() as conn:
+        row = conn.execute(
+            "SELECT COUNT(*) as count, MAX(cached_at) as last_scan FROM remote_zip_cache"
+        ).fetchone()
+    return {"count": row["count"], "last_scan": row["last_scan"]}
+
+
+def clear_remote_zip_cache() -> int:
+    with get_db() as conn:
+        return conn.execute("DELETE FROM remote_zip_cache").rowcount
+
+
 def mark_zip_processed(remote_path: str, file_size: int, status: str, error_msg: str | None = None) -> None:
     with get_db() as conn:
         conn.execute(
@@ -212,11 +251,13 @@ def get_stats() -> dict:
 
 
 def clear_sync_data() -> dict:
-    """Delete all processed_zips, uploaded_books, and sync_runs rows. Settings are kept."""
+    """Delete all processed_zips, uploaded_books, and sync_runs rows. Settings are kept.
+    Also resets the remote scan timestamp so the next sync does a full rescan."""
     with get_db() as conn:
         zips = conn.execute("DELETE FROM processed_zips").rowcount
         books = conn.execute("DELETE FROM uploaded_books").rowcount
         runs = conn.execute("DELETE FROM sync_runs").rowcount
+        conn.execute("DELETE FROM settings WHERE key = 'remote_cache_last_scan'")
     return {"zips": zips, "books": books, "runs": runs}