diff --git a/backend/alembic/versions/h3i4j5k6mn78_add_timezone_to_all_datetime_columns.py b/backend/alembic/versions/h3i4j5k6mn78_add_timezone_to_all_datetime_columns.py
new file mode 100644
index 0000000..84e005f
--- /dev/null
+++ b/backend/alembic/versions/h3i4j5k6mn78_add_timezone_to_all_datetime_columns.py
@@ -0,0 +1,268 @@
+"""Add timezone to all datetime columns
+
+Revision ID: h3i4j5k6mn78
+Revises: f063b3da67b6
+Create Date: 2026-06-01
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = 'h3i4j5k6mn78'
+down_revision: Union[str, Sequence[str], None] = 'f063b3da67b6'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.alter_column('users', 'lastLoginAt', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='lastLoginAt AT TIME ZONE \'UTC\'')
+    op.alter_column('users', 'createdAt', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='createdAt AT TIME ZONE \'UTC\'')
+    op.alter_column('users', 'updatedAt', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updatedAt AT TIME ZONE \'UTC\'')
+    op.alter_column('users', 'lockedUntil', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='lockedUntil AT TIME ZONE \'UTC\'')
+
+    op.alter_column('brands', 'last_queried_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='last_queried_at AT TIME ZONE \'UTC\'')
+    op.alter_column('brands', 'next_query_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='next_query_at AT TIME ZONE \'UTC\'')
+    op.alter_column('brands', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('brands', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('queries', 'last_queried_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='last_queried_at AT TIME ZONE \'UTC\'')
+    op.alter_column('queries', 'next_query_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='next_query_at AT TIME ZONE \'UTC\'')
+    op.alter_column('queries', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('queries', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('citation_records', 'queried_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='queried_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('attribution_records', 'published_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='published_at AT TIME ZONE \'UTC\'')
+    op.alter_column('attribution_records', 'window_end_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='window_end_at AT TIME ZONE \'UTC\'')
+    op.alter_column('attribution_records', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('attribution_records', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('contents', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('contents', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('content_versions', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('content_reviews', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('geo_plans', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('geo_plans', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('geo_plan_actions', 'completed_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='completed_at AT TIME ZONE \'UTC\'')
+    op.alter_column('geo_plan_actions', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('geo_plan_actions', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('suggestions', 'generated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='generated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('suggestions', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('competitors', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('competitor_insights', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('competitor_insights', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('distribution_schedules', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('distribution_schedules', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('brand_knowledge', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('brand_knowledge', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('keywords', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('agent_registry', 'last_heartbeat', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='last_heartbeat AT TIME ZONE \'UTC\'')
+    op.alter_column('agent_registry', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('agent_registry', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('agent_configs', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('agent_tasks', 'scheduled_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='scheduled_at AT TIME ZONE \'UTC\'')
+    op.alter_column('agent_tasks', 'started_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='started_at AT TIME ZONE \'UTC\'')
+    op.alter_column('agent_tasks', 'completed_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='completed_at AT TIME ZONE \'UTC\'')
+    op.alter_column('agent_tasks', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('agent_task_logs', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('detection_tasks', 'last_run_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='last_run_at AT TIME ZONE \'UTC\'')
+    op.alter_column('detection_tasks', 'next_run_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='next_run_at AT TIME ZONE \'UTC\'')
+    op.alter_column('detection_tasks', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('detection_tasks', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('monitoring_records', 'last_checked_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='last_checked_at AT TIME ZONE \'UTC\'')
+    op.alter_column('monitoring_records', 'next_check_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='next_check_at AT TIME ZONE \'UTC\'')
+    op.alter_column('monitoring_records', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('monitoring_records', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('content_baselines', 'recorded_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='recorded_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('trend_insights', 'period_start', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='period_start AT TIME ZONE \'UTC\'')
+    op.alter_column('trend_insights', 'period_end', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='period_end AT TIME ZONE \'UTC\'')
+    op.alter_column('trend_insights', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('trend_insights', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('query_tasks', 'scheduled_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='scheduled_at AT TIME ZONE \'UTC\'')
+    op.alter_column('query_tasks', 'started_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='started_at AT TIME ZONE \'UTC\'')
+    op.alter_column('query_tasks', 'completed_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='completed_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('usage_records', 'timestamp', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='timestamp AT TIME ZONE \'UTC\'')
+    op.alter_column('usage_records', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('api_keys', 'last_verified_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='last_verified_at AT TIME ZONE \'UTC\'')
+    op.alter_column('api_keys', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('api_keys', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('knowledge_bases', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('knowledge_bases', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('knowledge_documents', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('knowledge_documents', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('knowledge_chunks', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('knowledge_search_logs', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('knowledge_entities', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('knowledge_entities', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('knowledge_relations', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('organizations', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('organizations', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('org_members', 'joined_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='joined_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('lifecycle_projects', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('lifecycle_projects', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('project_stages', 'started_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='started_at AT TIME ZONE \'UTC\'')
+    op.alter_column('project_stages', 'completed_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='completed_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('alerts', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('alert_settings', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('alert_settings', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('platform_rules', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('platform_rule_versions', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('schema_suggestions', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('schema_suggestions', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('subscriptions', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('payment_orders', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('payment_orders', 'updated_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='updated_at AT TIME ZONE \'UTC\'')
+    op.alter_column('payment_orders', 'paid_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='paid_at AT TIME ZONE \'UTC\'')
+
+    op.alter_column('diagnosis_records', 'created_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='created_at AT TIME ZONE \'UTC\'')
+    op.alter_column('diagnosis_records', 'completed_at', type_=sa.DateTime(timezone=True), existing_type=sa.DateTime(), postgresql_using='completed_at AT TIME ZONE \'UTC\'')
+
+
+def downgrade() -> None:
+    op.alter_column('users', 'lastLoginAt', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('users', 'createdAt', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('users', 'updatedAt', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('users', 'lockedUntil', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('brands', 'last_queried_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('brands', 'next_query_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('brands', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('brands', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('queries', 'last_queried_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('queries', 'next_query_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('queries', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('queries', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('citation_records', 'queried_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('attribution_records', 'published_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('attribution_records', 'window_end_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('attribution_records', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('attribution_records', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('contents', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('contents', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('content_versions', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('content_reviews', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('geo_plans', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('geo_plans', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('geo_plan_actions', 'completed_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('geo_plan_actions', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('geo_plan_actions', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('suggestions', 'generated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('suggestions', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('competitors', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('competitor_insights', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('competitor_insights', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('distribution_schedules', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('distribution_schedules', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('brand_knowledge', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('brand_knowledge', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('keywords', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('agent_registry', 'last_heartbeat', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('agent_registry', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('agent_registry', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('agent_configs', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('agent_tasks', 'scheduled_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('agent_tasks', 'started_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('agent_tasks', 'completed_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('agent_tasks', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('agent_task_logs', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('detection_tasks', 'last_run_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('detection_tasks', 'next_run_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('detection_tasks', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('detection_tasks', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('monitoring_records', 'last_checked_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('monitoring_records', 'next_check_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('monitoring_records', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('monitoring_records', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('content_baselines', 'recorded_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('trend_insights', 'period_start', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('trend_insights', 'period_end', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('trend_insights', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('trend_insights', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('query_tasks', 'scheduled_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('query_tasks', 'started_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('query_tasks', 'completed_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('usage_records', 'timestamp', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('usage_records', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('api_keys', 'last_verified_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('api_keys', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('api_keys', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('knowledge_bases', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('knowledge_bases', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('knowledge_documents', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('knowledge_documents', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('knowledge_chunks', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('knowledge_search_logs', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('knowledge_entities', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('knowledge_entities', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('knowledge_relations', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('organizations', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('organizations', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('org_members', 'joined_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('lifecycle_projects', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('lifecycle_projects', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('project_stages', 'started_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('project_stages', 'completed_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('alerts', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('alert_settings', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('alert_settings', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('platform_rules', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('platform_rule_versions', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('schema_suggestions', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('schema_suggestions', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('subscriptions', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('payment_orders', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('payment_orders', 'updated_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('payment_orders', 'paid_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+
+    op.alter_column('diagnosis_records', 'created_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))
+    op.alter_column('diagnosis_records', 'completed_at', type_=sa.DateTime(), existing_type=sa.DateTime(timezone=True))