fix(db): add ondelete cascade to all FK constraints, fix multimodal flag persistence

- Add ondelete=CASCADE/SET NULL to all environment and translate FK constraints
- Add is_multimodal to GET /api/settings/consolidated response
- Fix toggleActive to not overwrite is_multimodal with false
- New SearchableMultiSelect component for dashboard search with multi-select
- Fix validation task page: task data unwrapping, date formatting, dashboard multi-select
- Fix infinite effect loop on dashboards page via queueMicrotask guard
- 3 new Alembic migrations (merge f0e9d8c7b6a5, translate b0c1d2e3f4a5)

backend/alembic/versions/a5b6c7d8e9f0_set_null_ondelete_for_task_records_env_fk.py

@@ -0,0 +1,50 @@
+"""set null ondelete for task_records environment FK
+
+Revision ID: a5b6c7d8e9f0
+Revises: c4a3a2f74bfe
+Create Date: 2026-05-21 18:55:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision: str = 'a5b6c7d8e9f0'
+down_revision: Union[str, Sequence[str], None] = 'c4a3a2f74bfe'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    op.drop_constraint(
+        'task_records_environment_id_fkey',
+        'task_records',
+        type_='foreignkey',
+    )
+    op.create_foreign_key(
+        'task_records_environment_id_fkey',
+        'task_records',
+        'environments',
+        ['environment_id'],
+        ['id'],
+        ondelete='SET NULL',
+    )
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    op.drop_constraint(
+        'task_records_environment_id_fkey',
+        'task_records',
+        type_='foreignkey',
+    )
+    op.create_foreign_key(
+        'task_records_environment_id_fkey',
+        'task_records',
+        'environments',
+        ['environment_id'],
+        ['id'],
+    )

backend/alembic/versions/b0c1d2e3f4a5_cascade_ondelete_translate_fks.py

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+"""cascade ondelete for all translate FK references (translation_jobs/runs/batches chain)
+
+Revision ID: b0c1d2e3f4a5
+Revises: f0e9d8c7b6a5
+Create Date: 2026-05-21 19:05:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision: str = 'b0c1d2e3f4a5'
+down_revision: Union[str, Sequence[str], None] = 'f0e9d8c7b6a5'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+# Each entry: (table, constraint_name, column, ref_table, ondelete_rule)
+FK_FIXES = [
+    # Direct FKs to translation_jobs.id
+    ('translation_runs', 'translation_runs_job_id_fkey', 'job_id', 'CASCADE'),
+    ('translation_events', 'translation_events_job_id_fkey', 'job_id', 'CASCADE'),
+    ('translation_preview_sessions', 'translation_preview_sessions_job_id_fkey', 'job_id', 'CASCADE'),
+    ('translation_schedules', 'translation_schedules_job_id_fkey', 'job_id', 'CASCADE'),
+    ('translation_job_dictionaries', 'translation_job_dictionaries_job_id_fkey', 'job_id', 'CASCADE'),
+    ('translation_metric_snapshots', 'translation_metric_snapshots_job_id_fkey', 'job_id', 'CASCADE'),
+    # FKs to translation_runs.id
+    ('translation_batches', 'translation_batches_run_id_fkey', 'run_id', 'CASCADE'),
+    ('translation_records', 'translation_records_run_id_fkey', 'run_id', 'CASCADE'),
+    ('translation_events', 'translation_events_run_id_fkey', 'run_id', 'SET NULL'),
+    ('translation_preview_sessions', 'translation_preview_sessions_run_id_fkey', 'run_id', 'SET NULL'),
+    ('translation_metric_snapshots', 'translation_metric_snapshots_run_id_fkey', 'run_id', 'SET NULL'),
+    ('translation_run_language_stats', 'translation_run_language_stats_run_id_fkey', 'run_id', 'CASCADE'),
+    # FKs to translation_batches.id
+    ('translation_records', 'translation_records_batch_id_fkey', 'batch_id', 'CASCADE'),
+    # FKs to translation_records.id
+    ('translation_languages', 'translation_languages_record_id_fkey', 'record_id', 'CASCADE'),
+    # FKs to translation_preview_sessions.id
+    ('translation_preview_records', 'translation_preview_records_session_id_fkey', 'session_id', 'CASCADE'),
+    # FKs to translation_preview_records.id
+    ('translation_preview_languages', 'translation_preview_languages_preview_record_id_fkey', 'preview_record_id', 'CASCADE'),
+]
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    for table, constraint, column, ondelete in FK_FIXES:
+        op.drop_constraint(constraint, table, type_='foreignkey')
+        op.create_foreign_key(
+            constraint, table, 'translation_jobs' if 'job_id' in column else (
+                'translation_runs' if 'run_id' in column else (
+                    'translation_batches' if 'batch_id' in column else (
+                        'translation_records' if 'record_id' in column and 'preview' not in constraint else (
+                            'translation_preview_sessions' if 'session_id' in column else (
+                                'translation_preview_records' if 'preview_record_id' in column else 'unknown'
+                            )
+                        )
+                    )
+                )
+            ),
+            [column], ['id'],
+            ondelete=ondelete,
+        )
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    ref_map = {
+        'job_id': 'translation_jobs',
+        'run_id': 'translation_runs',
+        'batch_id': 'translation_batches',
+        'record_id': 'translation_records',
+        'session_id': 'translation_preview_sessions',
+        'preview_record_id': 'translation_preview_records',
+    }
+    for table, constraint, column, _ondelete in reversed(FK_FIXES):
+        ref_table = ref_map[column]
+        op.drop_constraint(constraint, table, type_='foreignkey')
+        op.create_foreign_key(
+            constraint, table, ref_table,
+            [column], ['id'],
+        )

backend/alembic/versions/f0e9d8c7b6a5_cascade_ondelete_all_env_fks.py

@@ -0,0 +1,53 @@
+"""cascade ondelete for all remaining environments FK references
+
+Revision ID: f0e9d8c7b6a5
+Revises: a5b6c7d8e9f0, e5f4d3c2b1a
+Create Date: 2026-05-21 19:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision: str = 'f0e9d8c7b6a5'
+down_revision: Union[str, Sequence[str], None] = ('a5b6c7d8e9f0', 'e5f4d3c2b1a')
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+FK_DEFS = [
+    ('resource_mappings', 'resource_mappings_environment_id_fkey', 'environment_id'),
+    ('database_mappings', 'database_mappings_source_env_id_fkey', 'source_env_id'),
+    ('database_mappings', 'database_mappings_target_env_id_fkey', 'target_env_id'),
+    ('migration_jobs', 'migration_jobs_source_env_id_fkey', 'source_env_id'),
+    ('migration_jobs', 'migration_jobs_target_env_id_fkey', 'target_env_id'),
+    ('dataset_review_sessions', 'dataset_review_sessions_environment_id_fkey', 'environment_id'),
+]
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    for table, constraint_name, column in FK_DEFS:
+        op.drop_constraint(constraint_name, table, type_='foreignkey')
+        op.create_foreign_key(
+            constraint_name,
+            table,
+            'environments',
+            [column],
+            ['id'],
+            ondelete='CASCADE',
+        )
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    for table, constraint_name, column in reversed(FK_DEFS):
+        op.drop_constraint(constraint_name, table, type_='foreignkey')
+        op.create_foreign_key(
+            constraint_name,
+            table,
+            'environments',
+            [column],
+            ['id'],
+        )