fix: add page_count column to store comic page counts for PSE

The page count was being calculated during scan but never stored in the
database, causing PSE (Page Streaming Extension) to always report 0 pages
in OPDS feeds. OPDS clients like Panels require page count > 0 to enable
page streaming UI.

Changes:
- Add migration to add page_count column to items table
- Update upsert_file() to accept and store page_count parameter
- Update scan to pass calculated page_count to database
- Update schema.sql to document the new column

Author: Nadiar

app/db.py

@@ -80,6 +80,10 @@ def _ensure_schema(conn: sqlite3.Connection) -> None:
     if not _column_exists(conn, "meta", "format"):
         _add_column(conn, "meta", "format", "TEXT")
 
+    # migration: ensure 'page_count' column exists in items table
+    if not _column_exists(conn, "items", "page_count"):
+        _add_column(conn, "items", "page_count", "INTEGER DEFAULT 0")
+
     conn.execute("CREATE INDEX IF NOT EXISTS idx_items_parent   ON items(parent)")
     conn.execute("CREATE INDEX IF NOT EXISTS idx_items_name     ON items(name)")
     conn.execute("CREATE INDEX IF NOT EXISTS idx_items_isdir    ON items(is_dir)")
@@ -192,21 +196,22 @@ def upsert_dir(conn: sqlite3.Connection, rel: str, name: str, parent: str, mtime
         (rel, name, parent, mtime),
     )
 
-def upsert_file(conn: sqlite3.Connection, rel: str, name: str, size: int, mtime: float, parent: str, ext: str) -> None:
+def upsert_file(conn: sqlite3.Connection, rel: str, name: str, size: int, mtime: float, parent: str, ext: str, page_count: int = 0) -> None:
     """Insert or update a file entry in the database."""
     conn.execute(
         """
-        INSERT INTO items(rel, name, parent, is_dir, size, mtime, ext)
-        VALUES (?, ?, ?, 0, ?, ?, ?)
+        INSERT INTO items(rel, name, parent, is_dir, size, mtime, ext, page_count)
+        VALUES (?, ?, ?, 0, ?, ?, ?, ?)
         ON CONFLICT(rel) DO UPDATE SET
           name=excluded.name,
           parent=excluded.parent,
           is_dir=excluded.is_dir,
           size=excluded.size,
           mtime=excluded.mtime,
-          ext=excluded.ext
+          ext=excluded.ext,
+          page_count=excluded.page_count
         """,
-        (rel, name, parent, size, mtime, ext),
+        (rel, name, parent, size, mtime, ext, page_count),
     )
 
 def upsert_meta(conn: sqlite3.Connection, rel: str, meta: Dict[str, Any]) -> None:

app/main.py

@@ -250,6 +250,7 @@ def _run_scan():
                     mtime=mtime,
                     parent=_parent_rel(rel),
                     ext="cbz",
+                    page_count=page_count,
                 )
                 meta = _read_comicinfo(p)
                 if meta:

app/schema.sql

@@ -1,12 +1,13 @@
 -- Items (dirs & files)
 CREATE TABLE IF NOT EXISTS items (
-  rel    TEXT PRIMARY KEY,
-  name   TEXT,
-  parent TEXT,
-  is_dir INTEGER NOT NULL,
-  size   INTEGER,
-  mtime  REAL,
-  ext    TEXT
+  rel        TEXT PRIMARY KEY,
+  name       TEXT,
+  parent     TEXT,
+  is_dir     INTEGER NOT NULL,
+  size       INTEGER,
+  mtime      REAL,
+  ext        TEXT,
+  page_count INTEGER DEFAULT 0
 );
 CREATE INDEX IF NOT EXISTS idx_items_parent ON items(parent);
 CREATE INDEX IF NOT EXISTS idx_items_name   ON items(name);