storage/docs/architecture/overview.md

status, last_updated

status	last_updated
reviewed	2026-05-30

@alkdev/storage — Overview

Typed graph storage with dual database hosts. Deno-first, published via JSR.

Purpose

@alkdev/storage provides a metagraph storage model: graph types define schemas, node types define data shapes within those graphs, and edge types define typed relationships. Instances of these type definitions become actual graphs populated with nodes and edges.

This pattern replaces domain-specific table proliferation with a small number of general-purpose tables that can model anything — call graphs, ACL rules, task dependencies, encrypted secrets — while enforcing schema integrity through TypeBox validation.

The package evolved from @ade/ade-v0/packages/core/graphs and @ade/ade-v0/packages/storage_sqlite, simplified and refactored for the @alkdev ecosystem.

Architecture

@alkdev/storage/
├── mod.ts                   → re-exports graphs/ (zero db deps)
├── src/
│   ├── graphs/              → Metagraph Module, bridge functions, crypto (no db deps)
│   │   ├── modules/         → TypeBox Module definitions
│   │   │   ├── metagraph.ts → Config, BaseNode, BaseEdge
│   │   │   ├── call-graph.ts → CallGraph reference Module
│   │   │   ├── secret-graph.ts → SecretGraph reference Module
│   │   │   └── index.ts     → barrel re-export
│   │   ├── bridge.ts        → moduleToDbSchema, validateNode, validateEdge
│   │   ├── crypto.ts        → encrypt, decrypt, generateEncryptionKey, EncryptedDataSchema
│   │   └── mod.ts           → re-exports all graphs exports
│   ├── sqlite/              → SQLite host (drizzle-orm/libsql)
│   │   ├── tables/          → drizzle table definitions
│   │   ├── relations.ts     → drizzle relational mappings
│   │   ├── schema.ts        → barrel re-export
│   │   └── client.ts        → injectable createSqliteDatabase()
│   └── pg/                  → PostgreSQL host (NOT YET IMPLEMENTED)
└── test/
    └── reference-modules.test.ts → Metagraph, bridge, crypto tests

Subpath Exports (JSR/npm)

Export	Contents	Dependencies
@alkdev/storage	Graph schema types, Metagraph Module	@alkdev/typebox
@alkdev/storage/graphs	Same as . — alias for the main export	Same as .
@alkdev/storage/sqlite	SQLite tables, relations, client	@alkdev/drizzlebox, drizzle-orm, @libsql/client
@alkdev/storage/pg	PostgreSQL tables, relations, client	⚠️ NOT YET IMPLEMENTED

The ./graphs subpath exists because the source code lives in src/graphs/ and the main mod.ts re-exports it. Importing from either @alkdev/storage or @alkdev/storage/graphs yields the same types and Metagraph Module.

Terminology

Term	Definition
Metagraph	A type system where graph types define schemas, node types define data shapes within those graphs, and edge types define typed relationships. Graph instances are concrete data conforming to these type definitions.
Hub	The central service in the hub-spoke architecture. A consumer of @alkdev/storage — uses the PostgreSQL host for persistent graph storage. The hub also depends on @alkdev/operations, @alkdev/pubsub, @alkdev/flowgraph.
Spoke	A local/embedded instance that runs per-project or per-session. A consumer of @alkdev/storage — uses the SQLite host for local graph storage.
Graph type	A class of graphs (e.g., "call-graph", "acl"). Defines structural constraints (directed/undirected/mixed, multi-edges, self-loops) and the valid node/edge type vocabularies. Stored in the graph_types table.
Node type	A category of node within a graph type. Defines the attribute schema for nodes of that type. Stored in the node_types table.
Edge type	A category of edge within a graph type. Defines the attribute schema and optionally restricts which node types can be source/target. Stored in the edge_types table.
Graph instance	A concrete graph belonging to a graph type. Contains nodes and edges conforming to its type definitions. Stored in the graphs table.
Consumer	Code that imports @alkdev/storage (or a subpath) to define graph types and persist graph data. The hub, spokes, and other @alkdev packages are consumers.
Repository layer	⚠️ Not yet implemented. The typed CRUD functions (insert, find, update, delete) that sit between consumer code and raw Drizzle queries. Performs schema validation before writes. No dependency on @alkdev/operations — the consumer wires CRUD into the registry.
Validation boundary	The line where schema validation is enforced. In this package, validation happens in the Metagraph Module (at type definition time) and the repository layer (at mutation time), NOT in the database.

Design Decisions

All design decisions are documented as ADRs in decisions/.

ADR	Decision	Summary
001	Deno-first, JSR publishes	Published to JSR; npm comes free via @jsr/alkdev__storage
002	Metagraph over domain-specific tables	6 general-purpose tables serve all domains
003	TypeBox Module as API surface	Type.Module() replaces SchemaBuilder; Metagraph.Import() + Type.Composite()
004	Injectable clients, no side effects	createSqliteDatabase(client) takes a pre-created client
005	Drizzle + TypeBox via drizzlebox	Drizzle tables are single source of truth; drizzlebox generates TypeBox schemas
006	as const objects, not TypeScript enums	Avoids JSR slow-types; consistent pattern across codebase
007	No comments in code	Documentation lives in architecture docs and TypeBox descriptions
008	Common columns pattern	id, metadata, createdAt, updatedAt on every table

Dependencies

Package	Purpose	Layer
@alkdev/typebox	Runtime schema validation	graphs/
@alkdev/drizzlebox	Generate TypeBox from Drizzle tables	sqlite/
drizzle-orm	ORM, table definitions, queries	sqlite/ (and future pg/)
@libsql/client	SQLite client (libsql/turso)	sqlite/
postgres	PostgreSQL client	pg/ (not yet used)

@alkdev/typebox and @alkdev/drizzlebox are npm packages (not yet on JSR). JSR handles npm dependencies natively.

Ecosystem packages are not runtime dependencies of @alkdev/storage. All ecosystem references in this document describe consumer-side data shapes and integration patterns, not import dependencies. The @alkdev/operations, @alkdev/pubsub, @alkdev/flowgraph, and @alkdev/taskgraph packages are consumed by the hub and spokes, not by storage itself.

What Exists vs. What's Needed

Implemented

• Metagraph Module (Type.Module with Config, BaseNode, BaseEdge entries)
• Bridge functions (moduleToDbSchema, validateNode, validateEdge)
• Reference graph type Modules (CallGraph, SecretGraph)
• Crypto utility (AES-256-GCM + PBKDF2, EncryptedDataSchema)
• SQLite host: 6 metagraph tables + actors table + Drizzle relations + client factory
• TypeBox select/insert schemas generated from Drizzle tables (drizzlebox)
• Reference module tests (bridge functions, validation, Module composition)

Not Yet Implemented

Gap	Priority	Notes
Repository/CRUD layer	High	⚠️ Not yet implemented. Typed insert, find, update, delete functions for graphs, nodes, edges. No dependency on @alkdev/operations — consumer wires CRUD into registry.
PostgreSQL host	Medium	Same table shapes, pgTable + jsonb + timestamp + pgEnum. Stub only.
ACL graph type	Medium	Access control as a graph. Informed by @alkdev/operations' Identity and AccessControl. Depends on CRUD layer.
Task graph type	Low	Informed by @alkdev/taskgraph's TaskGraphNodeAttributes and DependencyEdge schemas.
Graphology bridge	Low	moduleToGraphology() and fromGraphologyExport() — Phase 4 of the metagraph implementation path.

Ecosystem Integration

@alkdev/storage is a data layer package consumed by other packages in the @alkdev ecosystem. It does not depend on the hub — the dependency flows the other way. The hub consumes storage (along with operations, pubsub, flowgraph, and taskgraph) as part of its architecture.

Dependency Direction

@alkdev/pubsub          ← transport only (no storage dependency)
    ↑
@alkdev/operations      ← call protocol, registry, identity, access control
    ↑                   (depends on: @alkdev/pubsub, @alkdev/typebox)
@alkdev/flowgraph       ← call graph schema, operation graph, workflow templates
    ↑                   (depends on: @alkdev/operations [peer], @alkdev/typebox)
@alkdev/taskgraph       ← task dependency graph schema, cost-benefit analysis
                        (depends on: @alkdev/typebox)

@alkdev/storage         ← YOU ARE HERE — typed graph persistence
                        (depends on: @alkdev/typebox, @alkdev/drizzlebox)

    ↑                       ↑
    |                       |
Hub / Spoke          Any consumer that needs
(consumes all)       persistent graph storage

The key insight: @alkdev/storage provides the persistence primitives (schemas, tables, repository layer). The domain semantics (what a call graph means, what identity looks like, how access control works) are defined by the packages above. Storage stores the shapes those packages define; it does not define the semantics itself.

What Comes from Where

Concept	Source package	Storage's role
Call protocol events (call.requested, call.responded, etc.)	@alkdev/operations	Storage persists the outcomes — graphs with CallNodeAttrs nodes
Identity (id, scopes, resources)	@alkdev/operations	Storage stores identity as node attributes; Identity is a data shape, not a storage concept
Access control (AccessControl, requiredScopes)	@alkdev/operations	Storage's ACL graph type mirrors the operations AccessControl schema as graph structure
Call graph schema (CallNodeAttrs, CallEdgeAttrs, CallStatus)	@alkdev/flowgraph	Storage persists these in-memory shapes to the database
Task graph schema (TaskGraphNodeAttributes, DependencyEdge)	@alkdev/taskgraph	Storage persists task dependency shapes
Event transport (TypedEventTarget, EventEnvelope)	@alkdev/pubsub	Storage is not involved in event routing; it stores the events' outcomes

Repository Layer Bridging Pattern (Consumer-Side Concern)

The repository layer in @alkdev/storage provides typed CRUD — no @alkdev/operations dependency. A consumer-side bridging module can then wire these CRUD functions into the @alkdev/operations registry, analogous to how drizzle-graphql auto-generates a GraphQL schema from Drizzle tables — but using operations (queries, mutations, subscriptions) instead of GraphQL resolvers. This works because:

1. @alkdev/operations already maps closely to GraphQL's queries/mutations/subscriptions (it was modeled after that pattern)
2. @alkdev/pubsub provides the subscription transport (forked from graphql-yoga's pubsub with additions)
3. @alkdev/storage's metagraph tables are the data source, analogous to Drizzle tables for drizzle-graphql

The bridging module would live in a consumer package (e.g., the hub or a dedicated @alkdev/storage-operations adapter), not in @alkdev/storage itself, to avoid circular dependencies:

@alkdev/storage → defines types + tables (no operations dependency)
@alkdev/operations → defines call protocol + registry (no storage dependency)
Consumer (hub / adapter) → imports both, generates operations from schemas

Avoiding Circular Dependencies

Neither @alkdev/storage nor @alkdev/operations should depend on each other directly. Storage defines the schema types and database tables; operations defines the call protocol and execution model. The consumer (hub, spoke, or adapter package) imports both and bridges them. This preserves the single-responsibility principle and allows each package to evolve independently.

If shared type definitions are needed (e.g., Identity referenced in both storage node attributes and operations call events), they should either:

1. Be duplicated in each package with a documented correspondence (acceptable for small, stable types)
2. Be extracted to a minimal shared types package if the duplication becomes burdensome

Open Questions

Open questions are tracked in open-questions.md. Key questions affecting this package:

• OQ-03: Should actors be a node type or a standalone table? (open, deferred to ACL design)
• OQ-04: Should the repository layer be host-specific or host-agnostic? (open, start host-specific)
• OQ-14: Should encryption be per-attribute, per-node, or per-graph? (resolved: per-attribute)
• OQ-15: Should key management be in this package? (resolved: no, application provides key ring)
• OQ-16: Should the repository layer live in storage or a consumer package? (resolved: CRUD in storage, operations bridging in consumer)

References

• Metagraph Module evolution: metagraph-module.md
• Schema evolution via TypeBox value system: schema-evolution.md
• Forward-looking connections: forward-look.md
• Operations architecture: /workspace/@alkdev/operations/docs/architecture/README.md
• Pubsub architecture: /workspace/@alkdev/pubsub/docs/architecture/README.md
• Flowgraph architecture: /workspace/@alkdev/flowgraph/docs/architecture/README.md
• Taskgraph architecture: /workspace/@alkdev/taskgraph_ts/docs/architecture/README.md
• drizzle-graphql (reference for repo bridging pattern): /workspace/drizzle-graphql/
• Source heritage: @ade/ade-v0/packages/core/graphs and @ade/ade-v0/packages/storage_sqlite
• Drizzle ORM: https://orm.drizzle.team/
• TypeBox: /workspace/@alkdev/typebox/
• JSR: https://jsr.io/