Can't locate revision identified by ''"
第一次初始化之後第一創建遷移腳本會出現上述錯誤，當前使用的數據庫沒有存放除了models.py中模型對應的表以外的表。如果有，請手動備份到另一個數據庫。由於存在這些無關表，flask-migrate嘗試去刪除這些無關表，當這些表存在外鍵索引時，刪除失敗，則可能導致數據庫遷移失敗。
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