When you auto-run EF Core migrations on application startup, one of the most confusing failures you can hit is:
The model for context 'XYZContext' has pending changes. Add a new…
How Migrations Work (Technical Overview)
Migration System Architecture:
EF Core compares your current model (from DbContext) with the snapshot (*ModelSnapshot.cs)
Differences generate migration operations via MigrationBuilder
Each migration is a class inheriting…
1xx - Informational
CodeNameWhen to Use100ContinueClient should continue with request (rare in APIs)101Switching ProtocolsUpgrading to WebSocket102ProcessingLong-running operation in progress (WebDAV)103Early HintsSend headers before final response
2xx - Success
CodeNameWhen to Use200OKStandard…