修正

backend/sql/migration_add_revision_tracking.sql

@@ -0,0 +1,30 @@
+-- Migration: Add is_latest and revision tracking columns
+
+-- 1. 添加新欄位到 journal_entries
+ALTER TABLE journal_entries 
+ADD COLUMN IF NOT EXISTS is_latest BOOLEAN DEFAULT true,
+ADD COLUMN IF NOT EXISTS revision_count INTEGER DEFAULT 1,
+ADD COLUMN IF NOT EXISTS original_entry_id INTEGER REFERENCES journal_entries(journal_entry_id) ON DELETE CASCADE;
+
+-- 2. 處理現有數據
+-- 將所有已刪除的交易標記為 is_latest = false
+UPDATE journal_entries 
+SET is_latest = false 
+WHERE is_deleted = true AND is_latest IS NOT NULL;
+
+-- 將所有活躍交易標記為 is_latest = true
+UPDATE journal_entries 
+SET is_latest = true 
+WHERE is_deleted = false AND is_latest IS NULL;
+
+-- 3. 創建索引以提高查詢性能
+CREATE INDEX IF NOT EXISTS idx_journal_entries_is_latest 
+ON journal_entries(is_latest, entry_date);
+
+CREATE INDEX IF NOT EXISTS idx_journal_entries_original_entry_id 
+ON journal_entries(original_entry_id);
+
+-- 4. 添加註釋說明
+COMMENT ON COLUMN journal_entries.is_latest IS '是否為最新版本（試算表使用此欄位過濾）';
+COMMENT ON COLUMN journal_entries.revision_count IS '修正版次（原始=1, 第1次修正=2, ...）';
+COMMENT ON COLUMN journal_entries.original_entry_id IS '指向原始交易（如果是修正版本）';