Implement full stack admin dashboard

backend/alembic/versions/003_add_admin_audit_log.py

@@ -0,0 +1,47 @@
+"""Add admin_audit_log table for persistent admin action tracking.
+
+Revision ID: 003_admin_audit_log
+Revises: 002_disputes
+Create Date: 2026-03-22
+
+Replaces the in-memory deque in admin.py with a persistent PostgreSQL
+table so audit entries survive restarts and are queryable with filters.
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+revision: str = "003_admin_audit_log"
+down_revision: Union[str, None] = "002_disputes"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "admin_audit_log",
+        sa.Column(
+            "id",
+            postgresql.UUID(as_uuid=True),
+            primary_key=True,
+            server_default=sa.text("gen_random_uuid()"),
+        ),
+        sa.Column("event", sa.String(100), nullable=False, index=True),
+        sa.Column("actor", sa.String(200), nullable=False),
+        sa.Column("role", sa.String(20), nullable=False, server_default="admin"),
+        sa.Column("details", postgresql.JSONB, nullable=False, server_default="{}"),
+        sa.Column(
+            "created_at",
+            sa.DateTime(timezone=True),
+            nullable=False,
+            server_default=sa.text("now()"),
+            index=True,
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("admin_audit_log")