-- DBN DMS migration 002 — soft-delete trash
-- Adds deleted_at / deleted_by columns to client_documents and client_folders.

-- client_documents.deleted_at
SET @col_exists := (
  SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'client_documents' AND COLUMN_NAME = 'deleted_at'
);
SET @sql := IF(@col_exists = 0,
  'ALTER TABLE client_documents
     ADD COLUMN deleted_at DATETIME NULL AFTER updated_at,
     ADD COLUMN deleted_by INT UNSIGNED NULL AFTER deleted_at,
     ADD KEY idx_deleted (deleted_at)',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- client_folders.deleted_at (folders table may not exist if migration 119 hasn't run; guard table too)
SET @tbl_exists := (
  SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES
  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'client_folders'
);
SET @col_exists := IF(@tbl_exists = 0, 1,
  (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
   WHERE TABLE_SCHEMA = DATABASE()
     AND TABLE_NAME = 'client_folders' AND COLUMN_NAME = 'deleted_at')
);
SET @sql := IF(@tbl_exists = 1 AND @col_exists = 0,
  'ALTER TABLE client_folders
     ADD COLUMN deleted_at DATETIME NULL,
     ADD COLUMN deleted_by INT UNSIGNED NULL,
     ADD KEY idx_deleted (deleted_at)',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;