feat: add Alembic migration 076 for membership & points system (#1895)

- Add is_member, member_type, member_expires_at, points_balance to users table
- Create points_accounts, points_transactions, points_orders, daily_usage_records tables
- Include proper indexes, constraints and downgrade path

alembic/versions/076_membership_points.py

@@ -0,0 +1,131 @@
+"""add membership & points system
+
+Revision ID: 076_membership_points
+Revises: 075_add_sentence_timings
+Create Date: 2026-09-15
+"""
+
+import sqlalchemy as sa
+from sqlalchemy import text
+
+from alembic import op
+
+revision = "076_membership_points"
+down_revision = "075_add_sentence_timings"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # 1. users 表新增字段
+    with op.batch_alter_table("users") as batch:
+        batch.add_column(
+            sa.Column("is_member", sa.Boolean(), nullable=False, server_default=sa.text("false")),
+        )
+        batch.add_column(
+            sa.Column("member_type", sa.String(20), nullable=True),
+        )
+        batch.add_column(
+            sa.Column("member_expires_at", sa.DateTime(), nullable=True),
+        )
+        batch.add_column(
+            sa.Column("points_balance", sa.Integer(), nullable=False, server_default=sa.text("0")),
+        )
+
+    # 2. points_accounts 积分账户表
+    op.create_table(
+        "points_accounts",
+        sa.Column("id", sa.String(36), primary_key=True),
+        sa.Column("user_id", sa.String(36), nullable=False, unique=True, index=True),
+        sa.Column("balance", sa.Integer(), nullable=False, server_default=sa.text("0")),
+        sa.Column("total_earned", sa.Integer(), nullable=False, server_default=sa.text("0")),
+        sa.Column("total_spent", sa.Integer(), nullable=False, server_default=sa.text("0")),
+        sa.Column(
+            "created_at",
+            sa.DateTime(),
+            nullable=False,
+            server_default=sa.text("NOW()"),
+        ),
+        sa.Column(
+            "updated_at",
+            sa.DateTime(),
+            nullable=False,
+            server_default=sa.text("NOW()"),
+        ),
+    )
+
+    # 3. points_transactions 积分流水表
+    op.create_table(
+        "points_transactions",
+        sa.Column("id", sa.String(36), primary_key=True),
+        sa.Column("user_id", sa.String(36), nullable=False, index=True),
+        sa.Column("account_id", sa.String(36), nullable=False, index=True),
+        sa.Column("type", sa.String(20), nullable=False, index=True),
+        sa.Column("source", sa.String(50), nullable=False, index=True),
+        sa.Column("amount", sa.Integer(), nullable=False),
+        sa.Column("balance_after", sa.Integer(), nullable=False),
+        sa.Column("description", sa.String(255), nullable=False, server_default=""),
+        sa.Column("ref_id", sa.String(100), nullable=False, server_default=""),
+        sa.Column(
+            "created_at",
+            sa.DateTime(),
+            nullable=False,
+            server_default=sa.text("NOW()"),
+        ),
+    )
+
+    # 4. points_orders 积分/会员订单表
+    op.create_table(
+        "points_orders",
+        sa.Column("id", sa.String(36), primary_key=True),
+        sa.Column("user_id", sa.String(36), nullable=False, index=True),
+        sa.Column("order_type", sa.String(20), nullable=False),
+        sa.Column("product_code", sa.String(50), nullable=False),
+        sa.Column("amount_cents", sa.Integer(), nullable=False),
+        sa.Column("original_amount_cents", sa.Integer(), nullable=False, server_default=sa.text("0")),
+        sa.Column("discount", sa.Float(), nullable=False, server_default=sa.text("1.0")),
+        sa.Column("points_amount", sa.Integer(), nullable=False, server_default=sa.text("0")),
+        sa.Column("status", sa.String(20), nullable=False, server_default="pending", index=True),
+        sa.Column("payment_method", sa.String(50), nullable=True),
+        sa.Column("payment_id", sa.String(100), nullable=True),
+        sa.Column("paid_at", sa.DateTime(), nullable=True),
+        sa.Column(
+            "created_at",
+            sa.DateTime(),
+            nullable=False,
+            server_default=sa.text("NOW()"),
+        ),
+    )
+
+    # 5. daily_usage_records 每日使用记录表
+    op.create_table(
+        "daily_usage_records",
+        sa.Column("id", sa.String(36), primary_key=True),
+        sa.Column("user_id", sa.String(36), nullable=False, index=True),
+        sa.Column("usage_date", sa.DateTime(), nullable=False),
+        sa.Column("usage_type", sa.String(50), nullable=False, server_default="free_clip"),
+        sa.Column("count", sa.Integer(), nullable=False, server_default=sa.text("0")),
+        sa.Column(
+            "updated_at",
+            sa.DateTime(),
+            nullable=False,
+            server_default=sa.text("NOW()"),
+        ),
+        sa.UniqueConstraint(
+            "user_id", "usage_date", "usage_type",
+            name="uq_daily_usage_user_date_type",
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("daily_usage_records")
+    op.drop_table("points_orders")
+    op.drop_table("points_transactions")
+    op.drop_table("points_accounts")
+
+    with op.batch_alter_table("users") as batch:
+        batch.drop_column("points_balance")
+        batch.drop_column("member_expires_at")
+        batch.drop_column("member_type")
+        batch.drop_column("is_member")