Cascade Role Invitations delete while deleting project

[Daksh2000]

Fixes: #17751

[di]

I think this should probably be done with an ondelete="CASCADE", similar to #3182.

[Daksh2000]

Hi @di , thank you for providing the reference, I tried adding cascade to "invitations" in Project Model and I was able to delete the projects with pending role_invitations
Although I did create alembic migrations as was the approach in previous issues, but I am not sure if they are needed here
PS - Below is my migration file (Not include in PR)

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Add cascade delete to RoleInvitation

Revision ID: a39f43699c08
Revises: 6de76386dbf4
Create Date: 2025-03-20 23:16:20.429394

"""

from alembic import op


# revision identifiers, used by Alembic.
revision = "a39f43699c08"
down_revision = "6de76386dbf4"


def upgrade() -> None:
    """Upgrade schema: Add cascade delete to RoleInvitation.project_id at DB level"""
    op.execute(
        "ALTER TABLE role_invitations "
        "DROP CONSTRAINT IF EXISTS role_invitations_project_id_fkey"
    )
    op.create_foreign_key(
        "role_invitations_project_id_fkey",
        "role_invitations",
        "projects",
        ["project_id"],
        ["id"],
        ondelete="CASCADE"  # Enforcing CASCADE at the DB level
    )


def downgrade() -> None:
    """Downgrade schema: Remove cascade delete from RoleInvitation.project_id"""
    op.drop_constraint("role_invitations_project_id_fkey", "role_invitations", type_="foreignkey")
    op.create_foreign_key(
        "role_invitations_project_id_fkey",
        "role_invitations",
        "projects",
        ["project_id"],
        ["id"]
    )