restructure of dirs, huge docs update

app/migrations/versions/002_add_scan_indexes.py

@@ -0,0 +1,28 @@
+"""Add indexes for scan queries
+
+Revision ID: 002
+Revises: 001
+Create Date: 2025-11-14 00:30:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '002'
+down_revision = '001'
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    """Add database indexes for better query performance."""
+    # Add index on scans.status for filtering
+    # Note: index on scans.timestamp already exists from migration 001
+    op.create_index('ix_scans_status', 'scans', ['status'], unique=False)
+
+
+def downgrade() -> None:
+    """Remove indexes."""
+    op.drop_index('ix_scans_status', table_name='scans')