feat: schema upgrade + import 159 books from reading list

- db.py: add group, isbn, priority, read_reason, read_order, cover_blob fields
- Import 159 books from booklist.md with group/priority/status metadata
- Include books.db in repo (personal use)

db.py

@@ -14,6 +14,12 @@ def _connect():
     return conn
 
 
+def _column_exists(conn, table, column):
+    """检查列是否已存在。"""
+    cols = conn.execute(f"PRAGMA table_info({table})").fetchall()
+    return any(c["name"] == column for c in cols)
+
+
 def init_db():
     """初始化数据库和表结构。"""
     conn = _connect()
@@ -39,6 +45,20 @@ def init_db():
             updated_at TEXT DEFAULT (datetime('now', 'localtime'))
         )
     """)
+    # v2 新增字段 — 兼容已有数据库
+    new_cols = [
+        ("\"group\"",   "TEXT DEFAULT ''"),
+        ("isbn",         "TEXT DEFAULT ''"),
+        ("priority",     "TEXT DEFAULT ''"),
+        ("read_reason",  "TEXT DEFAULT ''"),
+        ("read_order",   "INTEGER"),
+        ("cover_blob",   "BLOB"),
+        ("cover_local",  "TEXT DEFAULT ''"),
+    ]
+    for col_name, col_def in new_cols:
+        plain = col_name.strip('"')
+        if not _column_exists(conn, "books", plain):
+            conn.execute(f"ALTER TABLE books ADD COLUMN {col_name} {col_def}")
     conn.commit()
     conn.close()
 
@@ -46,17 +66,20 @@ def init_db():
 def add_book(title, *, author=None, translator=None, publisher=None,
              pub_date=None, cover_url=None, format="paper", status="to-read",
              rating=None, douban_score=None, goodreads_score=None,
-             tags="", notes=None, start_date=None, finish_date=None):
+             tags="", notes=None, start_date=None, finish_date=None,
+             group="", isbn="", priority="", read_reason="", read_order=None):
     """添加一本书，返回新书 ID。"""
     conn = _connect()
     cur = conn.execute("""
         INSERT INTO books (title, author, translator, publisher, pub_date,
                            cover_url, format, status, rating, douban_score,
-                           goodreads_score, tags, notes, start_date, finish_date)
-        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+                           goodreads_score, tags, notes, start_date, finish_date,
+                           "group", isbn, priority, read_reason, read_order)
+        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
     """, (title, author, translator, publisher, pub_date, cover_url,
           format, status, rating, douban_score, goodreads_score,
-          tags, notes, start_date, finish_date))
+          tags, notes, start_date, finish_date,
+          group, isbn, priority, read_reason, read_order))
     conn.commit()
     book_id = cur.lastrowid
     conn.close()
@@ -71,6 +94,8 @@ def update_book(book_id, **kwargs):
         "title", "author", "translator", "publisher", "pub_date",
         "cover_url", "format", "status", "rating", "douban_score",
         "goodreads_score", "tags", "notes", "start_date", "finish_date",
+        "group", "isbn", "priority", "read_reason", "read_order",
+        "cover_blob", "cover_local",
     }
     fields = {k: v for k, v in kwargs.items() if k in allowed}
     if not fields:
@@ -100,8 +125,8 @@ def get_book(book_id):
     return dict(row) if row else None
 
 
-def list_books(*, status=None, format=None, tag=None):
-    """查询书目列表，支持按状态/格式/标签过滤。"""
+def list_books(*, status=None, format=None, tag=None, group=None):
+    """查询书目列表，支持按状态/格式/标签/分组过滤。"""
     conn = _connect()
     query = "SELECT * FROM books WHERE 1=1"
     params = []
@@ -112,9 +137,11 @@ def list_books(*, status=None, format=None, tag=None):
         query += " AND format = ?"
         params.append(format)
     if tag:
-        # 逗号分隔的 tags 字段中模糊匹配
         query += " AND (',' || tags || ',' LIKE ?)"
         params.append(f"%,{tag},%")
+    if group:
+        query += ' AND "group" = ?'
+        params.append(group)
     query += " ORDER BY updated_at DESC"
     rows = conn.execute(query, params).fetchall()
     conn.close()
@@ -131,11 +158,15 @@ def get_stats():
     by_format = {}
     for row in conn.execute("SELECT format, COUNT(*) as cnt FROM books GROUP BY format"):
         by_format[row["format"]] = row["cnt"]
+    by_group = {}
+    for row in conn.execute('SELECT "group", COUNT(*) as cnt FROM books WHERE "group" != "" GROUP BY "group"'):
+        by_group[row["group"]] = row["cnt"]
     conn.close()
     return {
         "total": total,
         "by_status": by_status,
         "by_format": by_format,
+        "by_group": by_group,
     }