Fix server_default in migration

Author: r4victor

…_add_gatewaymodel_pipeline_and_to_be_.py …_add_gatewaymodel_pipeline_and_to_be_.pysrc/dstack/_internal/server/migrations/versions/2026/02_20_0957_aebe1aa5e38e_add_gatewaymodel_pipeline_and_to_be_.py renamed to src/dstack/_internal/server/migrations/versions/2026/02_23_0548_140331002ece_add_gatewaymodel_pipeline_and_to_be_.py src/dstack/_internal/server/migrations/versions/2026/02_20_0957_aebe1aa5e38e_add_gatewaymodel_pipeline_and_to_be_.py renamed to src/dstack/_internal/server/migrations/versions/2026/02_23_0548_140331002ece_add_gatewaymodel_pipeline_and_to_be_.py

@@ -1,8 +1,8 @@
 """Add GatewayModel pipeline and to_be_deleted columns
 
-Revision ID: aebe1aa5e38e
+Revision ID: 140331002ece
 Revises: a8ed24fd7f90
-Create Date: 2026-02-20 09:57:41.788746+00:00
+Create Date: 2026-02-23 05:48:55.948838+00:00
 
 """
 
@@ -13,7 +13,7 @@
 import dstack._internal.server.models
 
 # revision identifiers, used by Alembic.
-revision = "aebe1aa5e38e"
+revision = "140331002ece"
 down_revision = "a8ed24fd7f90"
 branch_labels = None
 depends_on = None
@@ -23,7 +23,7 @@ def upgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
     with op.batch_alter_table("gateways", schema=None) as batch_op:
         batch_op.add_column(
-            sa.Column("to_be_deleted", sa.Boolean(), server_default=sa.text("0"), nullable=False)
+            sa.Column("to_be_deleted", sa.Boolean(), server_default=sa.false(), nullable=False)
         )
         batch_op.add_column(
             sa.Column(