feat(core): add alembic migration for sequences table

alembic/versions/0009_sequences.py

@@ -0,0 +1,40 @@
+"""Create sequences table.
+
+Revision ID: 0009_sequences
+Revises: 0008_tax_rates
+Create Date: 2026-07-04
+"""
+
+from __future__ import annotations
+
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+revision: str = "0009_sequences"
+down_revision: Union[str, None] = "0008_tax_rates"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "sequences",
+        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True),
+        sa.Column("name", sa.String(100), nullable=False),
+        sa.Column("prefix", sa.String(20), nullable=False, server_default=""),
+        sa.Column("next_number", sa.Integer, nullable=False, server_default="1"),
+        sa.Column("padding", sa.Integer, nullable=False, server_default="4"),
+        sa.Column("tenant_id", postgresql.UUID(as_uuid=True), nullable=False, index=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+        sa.Column("updated_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+        sa.Column("deleted_at", sa.DateTime(timezone=True), nullable=True),
+    )
+    op.create_index("ix_sequences_tenant_name", "sequences", ["tenant_id", "name"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_sequences_tenant_name", table_name="sequences")
+    op.drop_table("sequences")