init push

migrations/20260626_helicopters_deleted_at_nullable.sql

@@ -0,0 +1,43 @@
+-- Add deleted_at to helicopters so takeover and usage queries can safely filter active rows.
+
+SET @schema_name := DATABASE();
+SET @has_helicopters := (
+  SELECT COUNT(*)
+  FROM information_schema.TABLES
+  WHERE TABLE_SCHEMA = @schema_name
+    AND TABLE_NAME = 'helicopters'
+);
+
+SET @has_deleted_at := (
+  SELECT COUNT(*)
+  FROM information_schema.COLUMNS
+  WHERE TABLE_SCHEMA = @schema_name
+    AND TABLE_NAME = 'helicopters'
+    AND COLUMN_NAME = 'deleted_at'
+);
+
+SET @sql_add_deleted_at := IF(
+  @has_helicopters > 0 AND @has_deleted_at = 0,
+  'ALTER TABLE helicopters ADD COLUMN deleted_at DATETIME(6) NULL AFTER updated_at',
+  'SELECT 1'
+);
+PREPARE stmt_add_deleted_at FROM @sql_add_deleted_at;
+EXECUTE stmt_add_deleted_at;
+DEALLOCATE PREPARE stmt_add_deleted_at;
+
+SET @idx_deleted_at_exists := (
+  SELECT COUNT(*)
+  FROM information_schema.STATISTICS
+  WHERE TABLE_SCHEMA = @schema_name
+    AND TABLE_NAME = 'helicopters'
+    AND INDEX_NAME = 'idx_helicopters_deleted_at'
+);
+
+SET @sql_add_deleted_at_idx := IF(
+  @has_helicopters > 0 AND @has_deleted_at > 0 AND @idx_deleted_at_exists = 0,
+  'ALTER TABLE helicopters ADD INDEX idx_helicopters_deleted_at (deleted_at)',
+  'SELECT 1'
+);
+PREPARE stmt_add_deleted_at_idx FROM @sql_add_deleted_at_idx;
+EXECUTE stmt_add_deleted_at_idx;
+DEALLOCATE PREPARE stmt_add_deleted_at_idx;