重构账单查询sql

Repository/AGENTS.md

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+# REPOSITORY LAYER KNOWLEDGE BASE
+
+**Generated:** 2026-01-28
+**Parent:** EmailBill/AGENTS.md
+
+## OVERVIEW
+Data access layer using FreeSql with BaseRepository pattern and global usings.
+
+## STRUCTURE
+```
+Repository/
+├── BaseRepository.cs           # Generic repository base
+├── GlobalUsings.cs            # Common imports
+├── BudgetRepository.cs         # Budget data access
+├── TransactionRecordRepository.cs # Transaction data access
+├── EmailMessageRepository.cs   # Email data access
+└── TransactionStatisticsDto.cs # Statistics DTOs
+```
+
+## WHERE TO LOOK
+| Task | Location | Notes |
+|------|----------|-------|
+| Base patterns | BaseRepository.cs | Generic CRUD operations |
+| Budget data | BudgetRepository.cs | Budget queries and updates |
+| Transaction data | TransactionRecordRepository.cs | Financial data access |
+| Email data | EmailMessageRepository.cs | Email processing storage |
+| Statistics | TransactionStatisticsDto.cs | Data transfer objects |
+
+## CONVENTIONS
+- Inherit from BaseRepository<T> for all repositories
+- Use GlobalUsings.cs for shared imports
+- Async/await pattern for all database operations
+- Method names: GetAllAsync, GetByIdAsync, InsertAsync, UpdateAsync
+- Return domain entities, not DTOs (except in query results)
+
+## ANTI-PATTERNS (THIS LAYER)
+- Never return anonymous types from methods
+- Don't expose FreeSql ISelect directly
+- Avoid business logic in repositories
+- No synchronous database calls
+- Don't mix data access with service logic
+
+## UNIQUE STYLES
+- Generic constraints: where T : BaseEntity
+- Fluent query building with FreeSql extension methods
+- Paged query patterns for large datasets