Initial MinerOps working checkpoint

backend/alembic/versions/0002_audit_logs.py

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+"""create audit logs table
+
+Revision ID: 0002_audit_logs
+Revises: 0001_foundation
+Create Date: 2026-07-08
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql
+
+
+revision: str = "0002_audit_logs"
+down_revision: Union[str, None] = "0001_foundation"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "audit_logs",
+        sa.Column("id", postgresql.UUID(as_uuid=True), primary_key=True, server_default=sa.text("gen_random_uuid()")),
+        sa.Column("actor_user_id", postgresql.UUID(as_uuid=True), sa.ForeignKey("users.id", ondelete="SET NULL"), nullable=True),
+        sa.Column("action", sa.Text(), nullable=False),
+        sa.Column("entity_type", sa.Text(), nullable=False),
+        sa.Column("entity_id", postgresql.UUID(as_uuid=True), nullable=True),
+        sa.Column("old_value_json", postgresql.JSONB(), nullable=True),
+        sa.Column("new_value_json", postgresql.JSONB(), nullable=True),
+        sa.Column("related_miner_asset_id", postgresql.UUID(as_uuid=True), nullable=True),
+        sa.Column("ip_address", postgresql.INET(), nullable=True),
+        sa.Column("user_agent", sa.Text(), nullable=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
+    )
+
+    op.create_index("idx_audit_logs_actor_user_id", "audit_logs", ["actor_user_id"])
+    op.create_index("idx_audit_logs_action", "audit_logs", ["action"])
+    op.create_index("idx_audit_logs_entity", "audit_logs", ["entity_type", "entity_id"])
+    op.create_index("idx_audit_logs_related_miner", "audit_logs", ["related_miner_asset_id"])
+    op.create_index("idx_audit_logs_created_at", "audit_logs", ["created_at"])
+
+
+def downgrade() -> None:
+    op.drop_index("idx_audit_logs_created_at", table_name="audit_logs")
+    op.drop_index("idx_audit_logs_related_miner", table_name="audit_logs")
+    op.drop_index("idx_audit_logs_entity", table_name="audit_logs")
+    op.drop_index("idx_audit_logs_action", table_name="audit_logs")
+    op.drop_index("idx_audit_logs_actor_user_id", table_name="audit_logs")
+    op.drop_table("audit_logs")