diff --git a/alembic/versions/0128_ai_decision_records.py b/alembic/versions/0128_ai_decision_records.py
index c04c2ae..faed8fe 100644
--- a/alembic/versions/0128_ai_decision_records.py
+++ b/alembic/versions/0128_ai_decision_records.py
@@ -15,24 +15,27 @@ depends_on = None
 
 
 def upgrade() -> None:
-    op.create_table(
-        "ai_decision_records",
-        sa.Column("id", UUID(as_uuid=True), primary_key=True, server_default=sa.text("gen_random_uuid()")),
-        sa.Column("tenant_id", UUID(as_uuid=True), sa.ForeignKey("tenants.id", ondelete="CASCADE"), nullable=False, index=True),
-        sa.Column("owner_id", UUID(as_uuid=True), nullable=True, index=True),
-        sa.Column("agent_run_id", UUID(as_uuid=True), nullable=False, index=True),
-        sa.Column("recommendation", sa.Text, nullable=False),
-        sa.Column("evidence", JSONB, nullable=False, server_default=sa.text("'{}'")),
-        sa.Column("reviewer_id", UUID(as_uuid=True), nullable=True),
-        sa.Column("decision", sa.String(20), nullable=True),
-        sa.Column("decision_timestamp", sa.String(40), nullable=True),
-        sa.Column("deviation_note", sa.Text, nullable=True),
-        sa.Column("created_at", sa.TIMESTAMP(timezone=True), server_default=sa.text("now()"), nullable=False),
-        sa.Column("updated_at", sa.TIMESTAMP(timezone=True), server_default=sa.text("now()"), nullable=False),
-        sa.Column("deleted_at", sa.TIMESTAMP(timezone=True), nullable=True),
-    )
-    op.create_index("ix_ai_decision_records_tenant_id", "ai_decision_records", ["tenant_id"])
-    op.create_index("ix_ai_decision_records_agent_run_id", "ai_decision_records", ["agent_run_id"])
+    # Use IF NOT EXISTS to avoid DuplicateTableError if table was already
+    # created by Base.metadata.create_all() in prestart.sh
+    op.execute("""
+        CREATE TABLE IF NOT EXISTS ai_decision_records (
+            id UUID NOT NULL DEFAULT gen_random_uuid() PRIMARY KEY,
+            tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
+            owner_id UUID,
+            agent_run_id UUID NOT NULL,
+            recommendation TEXT NOT NULL,
+            evidence JSONB NOT NULL DEFAULT '{}',
+            reviewer_id UUID,
+            decision VARCHAR(20),
+            decision_timestamp VARCHAR(40),
+            deviation_note TEXT,
+            created_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL,
+            updated_at TIMESTAMP WITH TIME ZONE DEFAULT now() NOT NULL,
+            deleted_at TIMESTAMP WITH TIME ZONE
+        )
+    """)
+    op.execute("CREATE INDEX IF NOT EXISTS ix_ai_decision_records_tenant_id ON ai_decision_records(tenant_id)")
+    op.execute("CREATE INDEX IF NOT EXISTS ix_ai_decision_records_agent_run_id ON ai_decision_records(agent_run_id)")
 
 
 def downgrade() -> None: