feat: add subscription and transaction repositories

- Implemented SubscriptionRepository with methods to get, create, and update subscriptions.
- Added BalanceTXRepository for creating and retrieving balance transactions.
- Introduced a test script for simulating Pally webhook for local testing.

alembic/versions/e8da1e4516fa_add_subscription_table.py

@@ -0,0 +1,39 @@
+"""add subscription table
+
+Revision ID: e8da1e4516fa
+Revises: d21c5f9364ea
+Create Date: 2026-04-25 16:29:08.186456
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'e8da1e4516fa'
+down_revision: Union[str, Sequence[str], None] = 'd21c5f9364ea'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('subscriptions',
+    sa.Column('user_id', sa.BIGINT(), nullable=False),
+    sa.Column('end_date', sa.DateTime(timezone=True), nullable=False),
+    sa.Column('autorenew', sa.Boolean(), nullable=False),
+    sa.Column('status', sa.Enum('EXPIRED', 'ACTIVE', name='subscriptionstatus'), nullable=False),
+    sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+    sa.PrimaryKeyConstraint('user_id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('subscriptions')
+    # ### end Alembic commands ###