refactor: replace mempool internal API with a more generic config API

lnbits/extensions/watchonly/crud.py

@@ -238,41 +238,3 @@ async def get_config(user: str) -> Optional[Config]:
         """SELECT json_data FROM watchonly.config WHERE "user" = ?""", (user,)
     )
     return json.loads(row[0], object_hook=lambda d: Config(**d)) if row else None
-
-
-######################MEMPOOL#######################
-### TODO: fix statspay dependcy and remove
-async def create_mempool(user: str) -> Optional[Mempool]:
-    await db.execute(
-        """
-        INSERT INTO watchonly.mempool ("user",endpoint)
-        VALUES (?, ?)
-        """,
-        (user, "https://mempool.space"),
-    )
-    row = await db.fetchone(
-        """SELECT * FROM watchonly.mempool WHERE "user" = ?""", (user,)
-    )
-    return Mempool.from_row(row) if row else None
-
-
-### TODO: fix statspay dependcy and remove
-async def update_mempool(user: str, **kwargs) -> Optional[Mempool]:
-    q = ", ".join([f"{field[0]} = ?" for field in kwargs.items()])
-
-    await db.execute(
-        f"""UPDATE watchonly.mempool SET {q} WHERE "user" = ?""",
-        (*kwargs.values(), user),
-    )
-    row = await db.fetchone(
-        """SELECT * FROM watchonly.mempool WHERE "user" = ?""", (user,)
-    )
-    return Mempool.from_row(row) if row else None
-
-
-### TODO: fix statspay dependcy and remove
-async def get_mempool(user: str) -> Mempool:
-    row = await db.fetchone(
-        """SELECT * FROM watchonly.mempool WHERE "user" = ?""", (user,)
-    )
-    return Mempool.from_row(row) if row else None