admin/_docs/02_document/modules/common_database_schema_holder.md

Module: Azaion.Common.Database.AzaionDbSchemaHolder

Purpose

Static holder for the linq2db MappingSchema that maps C# entities to PostgreSQL table/column naming conventions and handles custom type conversions.

Public Interface

Member	Type	Description
MappingSchema	static readonly MappingSchema	Pre-built schema with column name and type mappings

Internal Logic

Static constructor:

1. Creates a MappingSchema with a global callback that converts all column names to snake_case via StringExtensions.ToSnakeCase.
2. Uses FluentMappingBuilder to configure the User entity:
   • Table name: "users"
   • Id: primary key, DataType.Guid
   • Role: stored as text, with custom conversion to/from RoleEnum via Enum.Parse
   • UserConfig: stored as nullable JSON text, serialized/deserialized via Newtonsoft.Json

Dependencies

• User, RoleEnum entities
• StringExtensions.ToSnakeCase
• linq2db MappingSchema, FluentMappingBuilder
• Newtonsoft.Json

Consumers

• DbFactory.LoadOptions — passes MappingSchema to DataOptions.UseMappingSchema()

Data Models

Defines the ORM mapping for the users table.

Configuration

None — all mappings are compile-time.

External Integrations

None directly; mappings are used when queries execute against PostgreSQL.

Security

None.

Tests

None.