Implement Phase 3: Advanced search, real-time notifications, and Velociraptor integration

Co-authored-by: mblanke <9078342+mblanke@users.noreply.github.com>

backend/alembic/versions/b2c3d4e5f6g7_add_phase_3_tables.py

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+"""Add Phase 3 tables
+
+Revision ID: b2c3d4e5f6g7
+Revises: a1b2c3d4e5f6
+Create Date: 2025-12-09 17:30:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'b2c3d4e5f6g7'
+down_revision: Union[str, Sequence[str], None] = 'a1b2c3d4e5f6'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema for Phase 3."""
+    
+    # Create notifications table
+    op.create_table(
+        'notifications',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('user_id', sa.Integer(), nullable=False),
+        sa.Column('tenant_id', sa.Integer(), nullable=False),
+        sa.Column('title', sa.String(), nullable=False),
+        sa.Column('message', sa.Text(), nullable=False),
+        sa.Column('notification_type', sa.String(), nullable=False),
+        sa.Column('is_read', sa.Boolean(), nullable=False),
+        sa.Column('link', sa.String(), nullable=True),
+        sa.Column('created_at', sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(['tenant_id'], ['tenants.id'], ),
+        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_notifications_id'), 'notifications', ['id'], unique=False)
+    op.create_index(op.f('ix_notifications_created_at'), 'notifications', ['created_at'], unique=False)
+
+
+def downgrade() -> None:
+    """Downgrade schema for Phase 3."""
+    
+    # Drop notifications table
+    op.drop_index(op.f('ix_notifications_created_at'), table_name='notifications')
+    op.drop_index(op.f('ix_notifications_id'), table_name='notifications')
+    op.drop_table('notifications')