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