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Bitwarden primarily stores data in MSSQL (Microsoft SQL Server). The data access layer in the Server is written using Dapper which is a lightweight object mapper for .NET.
See Server Setup Guide.
The dev/migrate.ps1 helper script uses our
MsSql Migrator Utility to
run migrations. You should run the helper script whenever you sync with the main branch or create
a new migration script. Migrations that have already been run are tracked in the Migration table
of your database.
The process for modifying the database is described in Migrations.