Replaced generic ASP.NET Core API guidelines in.github/copilot-instructions.md with FluentMigrator-specific migration framework patterns.

Removed:

• ASP.NET Core content (authentication, API versioning, middleware)
• Generic data access patterns irrelevant to a migration library

Added:

• Project context: 11 supported database providers (SQL Server, PostgreSQL, MySQL, SQLite, Oracle, Firebird, Snowflake, SAP HANA, Jet, Redshift, DB2)
• Migration patterns:Up()/Down() structure,AutoReversingMigration, timestamp-based versioning
• Database-agnostic code:IfDatabase() usage withProcessorIdConstants
• Testing patterns: NUnit fixtures with Shouldly assertions, integration test organization
• Architecture: Processor/generator implementation, project structure, extension method conventions
• Build/test:dotnet build/test workflows, GitVersion integration

Example migration pattern:

[Migration(20090906205342)]publicclassAddUsersTable:Migration{publicoverridevoidUp()=>Create.Table("Users").WithIdColumn().WithColumn("Name").AsString().NotNullable();publicoverridevoidDown()=>Delete.Table("Users");}

Retained:

• C# 13 language guidelines
• .editorconfig alignment (naming, formatting)
• Nullable reference type patterns
• XML documentation standards

• Fixes✨ Set up Copilot instructions #2179

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn moreCopilot coding agent tips in the docs.