重构账单查询sql

Entity/AGENTS.md

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+# ENTITY LAYER KNOWLEDGE BASE
+
+**Generated:** 2026-01-28
+**Parent:** EmailBill/AGENTS.md
+
+## OVERVIEW
+Database entities using FreeSql ORM with BaseEntity inheritance pattern.
+
+## STRUCTURE
+```
+Entity/
+├── BaseEntity.cs          # Base entity with Snowflake ID
+├── GlobalUsings.cs        # Common imports
+├── BudgetRecord.cs        # Budget tracking entity
+├── TransactionRecord.cs   # Transaction entity
+├── EmailMessage.cs        # Email processing entity
+└── MessageRecord.cs       # Message entity
+```
+
+## WHERE TO LOOK
+| Task | Location | Notes |
+|------|----------|-------|
+| Base entity pattern | BaseEntity.cs | Snowflake ID, audit fields |
+| Budget entities | BudgetRecord.cs, BudgetArchive.cs | Budget tracking |
+| Transaction entities | TransactionRecord.cs, TransactionPeriodic.cs | Financial transactions |
+| Email entities | EmailMessage.cs, MessageRecord.cs | Email processing |
+
+## CONVENTIONS
+- Inherit from BaseEntity for all entities
+- Use [Column] attributes for FreeSql mapping
+- Snowflake IDs via YitIdHelper.NextId()
+- Chinese comments for business logic
+- XML docs for public APIs
+
+## ANTI-PATTERNS (THIS LAYER)
+- Never use DateTime.Now (use IDateTimeProvider)
+- Don't skip BaseEntity inheritance
+- Avoid complex business logic in entities
+- No database queries in entity classes
+
+## UNIQUE STYLES
+- Fluent Chinese naming for business concepts
+- Audit fields (CreateTime, UpdateTime) automatic
+- Soft delete patterns via UpdateTime nullability