diff --git a/backend/alembic/versions/v1_0_0_f061_enterprise_info_tenant_id.py b/backend/alembic/versions/v1_0_0_f061_enterprise_info_tenant_id.py
index e2f2b48fe..0ca62ff85 100644
--- a/backend/alembic/versions/v1_0_0_f061_enterprise_info_tenant_id.py
+++ b/backend/alembic/versions/v1_0_0_f061_enterprise_info_tenant_id.py
@@ -21,8 +21,6 @@
 from typing import Sequence, Union
 
 from alembic import op
-import sqlalchemy as sa
-from sqlalchemy.dialects import postgresql
 
 # revision identifiers, used by Alembic.
 revision: str = "f061_enterprise_info_tenant_id"
@@ -32,15 +30,38 @@
 
 
 def upgrade() -> None:
+    # This migration must be idempotent with respect to a freshly created schema.
+    # 001_initial_schema.py builds the schema with Base.metadata.create_all(), which
+    # already produces enterprise_info.tenant_id because the model declares it, so an
+    # unconditional op.add_column() fails on every fresh deployment and
+    # `alembic upgrade head` cannot complete.
+    #
+    # The IF NOT EXISTS / IF EXISTS guards match the convention already used in
+    # 010_column_modify.py, and make the module docstring's "Safe for retry" claim hold.
+
     # 1. Add tenant_id column with default uuid generator or nullable first if populated
-    op.add_column("enterprise_info", sa.Column("tenant_id", postgresql.UUID(as_uuid=True), nullable=True))
-    op.create_index(op.f("ix_enterprise_info_tenant_id"), "enterprise_info", ["tenant_id"], unique=False)
+    op.execute("ALTER TABLE enterprise_info ADD COLUMN IF NOT EXISTS tenant_id UUID")
+    op.execute(
+        "CREATE INDEX IF NOT EXISTS ix_enterprise_info_tenant_id ON enterprise_info (tenant_id)"
+    )
 
     # 2. Drop legacy single info_type unique constraint
-    op.drop_constraint("enterprise_info_info_type_key", "enterprise_info", type_="unique")
+    op.execute("ALTER TABLE enterprise_info DROP CONSTRAINT IF EXISTS enterprise_info_info_type_key")
 
     # 3. Create new composite unique constraint (tenant_id, info_type)
-    op.create_unique_constraint("uq_enterprise_info_tenant_type", "enterprise_info", ["tenant_id", "info_type"])
+    op.execute(
+        """
+        DO $$
+        BEGIN
+            IF NOT EXISTS (
+                SELECT 1 FROM pg_constraint WHERE conname = 'uq_enterprise_info_tenant_type'
+            ) THEN
+                ALTER TABLE enterprise_info
+                    ADD CONSTRAINT uq_enterprise_info_tenant_type UNIQUE (tenant_id, info_type);
+            END IF;
+        END $$;
+        """
+    )
 
 
 def downgrade() -> None: