Migrate 1

from sentry.models import *
dupe_envs = Environment.objects.values('name', 'organization_id').annotate(ecount=Count('id')).filter(ecount__gt=1)
for env in dupe_envs:
    name = env['name']
    organization_id = env['organization_id']
    envs = list(Environment.objects.filter(
        name=name,
        organization_id=organization_id,
    ).order_by('date_added'))
    to_env = envs[0]
    from_envs = envs[1:]
    try:
        with transaction.atomic():
            EnvironmentProject.objects.filter(
                environment__in=from_envs,
            ).update(environment=to_env)
    except IntegrityError:
        for ep in EnvironmentProject.objects.filter(environment__in=from_envs):
            try:
                with transaction.atomic():
                    EnvironmentProject.objects.filter(
                        id=ep.id,
                    ).update(environment=to_env)
            except IntegrityError:
                ep.delete()
    from_env_ids = [e.id for e in from_envs]
    try:
        with transaction.atomic():
            ReleaseEnvironment.objects.filter(
                environment_id__in=from_env_ids,
            ).update(environment_id=to_env.id)
    except IntegrityError:
        for re in ReleaseEnvironment.objects.filter(environment_id__in=from_env_ids):
            try:
                with transaction.atomic():
                    ReleaseEnvironment.objects.filter(
                        id=re.id,
                    ).update(environment_id=to_env.id)
            except IntegrityError:
                re.delete()
    Environment.objects.filter(id__in=from_env_ids).delete()