jasperfx-marten

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name: jasperfx-marten description: Use for any request involving Marten (.NET document database and event store on PostgreSQL): document storage, event sourcing, projections, aggregates, multi-tenancy, LINQ queries, async daemon, commit listeners, natural keys, or Marten + Wolverine integration. Always trigger when the user mentions Marten, event sourcing, event store, stream projections, SingleStreamProjection, MultiStreamProjection, IDocumentSession, IQuerySession, async daemon, conjoined tenancy, or asks about building read models from events — even if they don't name Marten explicitly.

Marten Skill

Marten turns PostgreSQL into both a document database and an event store. It is the data persistence layer in the Critter Stack alongside Wolverine.

Key mental model: Write model = events + aggregates. Read model = projections (built by the async daemon from events).

Reference Index

File	Topics
marten-setup.md	NuGet setup, AddMarten(), connection, event registration, Wolverine integration, session types
marten-documents.md	Document storage (Store/Load/Delete), LINQ queries, text search, pagination, includes, natural keys
marten-events.md	Events design, StartStream/Append, AggregateStreamAsync, FetchStreamStateAsync, aggregates, ISoftDeleted
marten-projections.md	SingleStreamProjection, MultiStreamProjection, lifecycle, registration, enrichment, composite projections
marten-multi-tenancy.md	Conjoined tenancy config, per-tenant sessions, middleware pattern, DI session registration, global documents ([DoNotPartition]), cross-tenant queries, projection tenancy, table partitioning, indexes, DeleteAllTenantDataAsync, MultiTenancyConstants
marten-postgres-extensions.md	pg_trgm, unaccent extensions, NgramIndex/NgramSearch, FullTextIndex/PlainTextSearch/PhraseSearch/WebStyleSearch, GinIndexJsonData, UseNGramSearchWithUnaccent, Aspire WithCreationScript, index strategy, common mistakes
marten-advanced.md	Async daemon, commit listeners, side effects, metadata, natural keys, performance

Quick Reference

// Session types
IDocumentSession   // read + write; auto-committed by Wolverine
IQuerySession      // read-only; inject for queries

// Events
session.Events.StartStream<TAggregate>(id, event1, event2);
session.Events.Append(id, @event);
var agg = await session.Events.AggregateStreamAsync<TAggregate>(id);
var state = await session.Events.FetchStreamStateAsync(id);

// Documents
session.Store(doc);
var doc = await session.LoadAsync<T>(id);
var list = await session.Query<T>().Where(...).ToListAsync();

See Also

• Official Marten Docs
• Marten Guide (project)
• Event Sourcing Guide (project)
• Wolverine skill for handler + transaction patterns