duempelkas/.github/prompts/03-dbcontext-mappings.prompt.md

description, agent

description	agent
Implement FinanceDbContext with fluent entity configurations, indexes, relationships, and SQLite connection setup	agent

Step 3: DbContext & Mappings

Create src/Duempelkas.Infrastructure/Persistence/FinanceDbContext.cs.

DbSets

• DbSet<Account> Accounts
• DbSet<AccountYear> AccountYears
• DbSet<Entry> Entries
• DbSet<TransferLink> TransferLinks

Connection

• Accept SQLite connection string via constructor options.
• Default path: Data Source=duempelkas.db in the app's base directory.

Entity Configurations (use OnModelCreating with IEntityTypeConfiguration<T> or inline)

Account

• Name required, max length 200.
• Cascade delete → AccountYears.

AccountYear

• Unique index on (AccountId, Year).
• OpeningBalance column type decimal(18,2).
• Cascade delete → Entries.

Entry

• Index on (AccountYearId, Date).
• Amount column type decimal(18,2).
• Type stored as int.
• Optional FK to TransferLink (TransferLinkId), restrict delete.

TransferLink

• Unique index on SourceEntryId.
• Unique index on TargetEntryId.
• Relationships to SourceEntry and TargetEntry with DeleteBehavior.Restrict.

Notes

• Use separate IEntityTypeConfiguration<T> classes in Persistence/Configurations/.
• Do not auto-generate migrations; the initial migration will be created manually later.