107 lines
6.3 KiB
Markdown
107 lines
6.3 KiB
Markdown
---
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status: draft
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last_updated: 2026-10-06
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---
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# alkstore — Architecture
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Architecture documentation for the alkstore project: one reactive
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store interface (notify, streams, queues, locks, scheduler, outbox)
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over SQLite and Postgres, with each engine native underneath
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(see [overview.md](overview.md)).
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## Current State
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**Phase 1 (Architecture) — in progress.** Phase 0 is complete
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(`docs/research/phase-0.md`): both POCs ran and passed, the scope
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inventory is confirmed, and the crate split, drivers, and ownership
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postures are decided. This directory carries the architecture spec
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build-out over that evidence base; all spec documents are `draft`
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pending architecture review and OQ resolution.
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## Architecture Documents
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| Doc | Status | Purpose | Key OQs |
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| [overview.md](overview.md) | draft | Crate family, feature surface, non-goals, evidence base | — |
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| [core-contract.md](core-contract.md) | draft | The unified trait surface, delivery guarantees, tx seam | OQ-10 |
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| [engine-sqlite.md](engine-sqlite.md) | draft | SQLite engine: forked-substrate/rusqlite mapping | OQ-06 (resolved), OQ-12 (resolved), OQ-13 (resolved) |
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| [engine-postgres.md](engine-postgres.md) | draft | Postgres engine: tokio-postgres/LISTEN mapping | OQ-08 (resolved), OQ-12 (resolved), OQ-13 (resolved) |
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| [queues.md](queues.md) | draft | Queue/scheduler/outbox semantics depth (resolved: ADR-009/ADR-010) | OQ-06 (resolved) |
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| [deployment.md](deployment.md) | draft | Host semantics, connection budgets, knobs, matrix | OQ-08 (resolved) |
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| [open-questions.md](open-questions.md) | draft | OQ tracker (promoted from OQ-ST register) | — |
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## Architecture Decision Records
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| ADR | Title | Status |
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| [001](decisions/001-crate-split.md) | Reactive-core crate + per-engine crates | Accepted |
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| [002](decisions/002-feature-scope.md) | Feature scope — inventory-confirmed surface | Accepted |
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| [003](decisions/003-sqlite-driver.md) | SQLite engine — rusqlite + honker-core lineage, bridged seam (ownership: ADR-011) | Accepted |
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| [004](decisions/004-postgres-driver.md) | Postgres engine — tokio-postgres + deadpool, hand-rolled LISTEN | Accepted |
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| [005](decisions/005-dependency-ownership.md) | Published libraries by default, named fork triggers | Accepted |
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| [006](decisions/006-wake-and-delivery-contract.md) | Wake contract — opaque wake + re-read; notify-vs-streams split | Accepted |
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| [007](decisions/007-transactional-seam.md) | Transactional seam — caller-held `TxHandle`, `*_tx` methods | Accepted |
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| [008](decisions/008-contract-v1-pinning.md) | Contract v1 surface pinning — surface partition, `TxHandle` shape, wake type, reserved strings, error taxonomy | Accepted |
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| [009](decisions/009-scheduler-collapse.md) | Scheduler collapse — queues + `schedule()`/`run_schedules`, `@every`-only v1, boundary guarantee row | Accepted |
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| [010](decisions/010-queue-semantics-depth.md) | Queue semantics depth — visibility/renewal, backoff curve, dead-letter, no-stranded-rows sweep, schema layout | Accepted |
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| [011](decisions/011-sqlite-substrate-fork.md) | SQLite substrate — fork honker-core into owned code | Accepted |
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| [012](decisions/012-forked-substrate-design.md) | Forked substrate design — contract-blind boundary, fidelity posture, port deltas | Accepted |
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| [013](decisions/013-fold-substrate-into-sqlite.md) | Fold the forked substrate into `alkstore-sqlite` — no fourth crate | Accepted |
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| [014](decisions/014-outbox-tx-enqueue.md) | Transactional outbox enqueue — `outbox_enqueue_tx` on the `TxHandle` trait | Accepted |
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| [015](decisions/015-streams-depth.md) | Streams depth — carried-metadata keys, global-FIFO ordering row, `StreamEvent` shape, `publish_with_key_tx`, `trim_to` | Accepted |
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| [016](decisions/016-deployment-honesty.md) | Deployment honesty — no runtime capability surface; compile-time engine identity + documented matrix | Accepted |
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## Open Questions
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Tracked in [open-questions.md](open-questions.md) (OQ-01..NN; the
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Phase 0 register's OQ-ST-01..08 promote one-to-one — OQ-NN mirrors
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OQ-ST-NN — with new Phase 1 questions appended after). Open, in
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suggested resolution order:
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- **OQ-10** (medium): contract versioning across engine crates.
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- **OQ-11** (medium): forked-substrate follow-through (provenance
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register format, cherry-pick procedure; item (1) dissolved by
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[ADR-013](decisions/013-fold-substrate-into-sqlite.md)).
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Resolved (kept with resolutions): OQ-01 (feature scope), OQ-02
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(crate split), OQ-03 (drivers), OQ-07 (extension surface cut),
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~~OQ-04~~ (contract v1 pinning —
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[ADR-008](decisions/008-contract-v1-pinning.md)), ~~OQ-09~~
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(scheduler collapse — [ADR-009](decisions/009-scheduler-collapse.md);
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scheduler guarantee row pinned), ~~OQ-05~~ (queue semantics depth —
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[ADR-010](decisions/010-queue-semantics-depth.md)), ~~OQ-06~~
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(honker-core quality read — fork fired,
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[ADR-011](decisions/011-sqlite-substrate-fork.md)), ~~OQ-08~~
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(capability-surface shape — none, by default ever;
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[ADR-016](decisions/016-deployment-honesty.md)), ~~OQ-13~~
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(transactional outbox enqueue shape —
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[ADR-014](decisions/014-outbox-tx-enqueue.md)), ~~OQ-12~~ (streams
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depth — [ADR-015](decisions/015-streams-depth.md)).
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No deferred OQs: all open questions are actionable Phase 1 work with
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complete evidence bases.
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## Document Lifecycle
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| Status | Meaning | Transitions |
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| `draft` | Under active development; may change significantly | → `reviewed` when the doc's OQs are resolved |
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| `reviewed` | Architecture final; implementation may begin | → `stable` when implementation verified |
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| `stable` | Locked; changes need review, may warrant an ADR | → `deprecated` when superseded |
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| `deprecated` | Superseded; kept for reference | Removed when unreferenced |
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All spec documents carry YAML frontmatter (`status`, `last_updated`);
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ADRs carry a `## Status` section (Accepted/Proposed/Superseded).
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## Provenance of decisions
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Phase 1 inherits its decisions from Phase 0's evidence base — every
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Accepted ADR above cites its POC findings and register record. The
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research documents remain the deep background:
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- `docs/research/phase-0.md` — vision, prior art, OQ-ST register,
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convergence.
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- `docs/research/consumer-inventory.md` — per-feature scope evidence.
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- `docs/research/poc-sqlite-posture-findings.md` /
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`docs/research/poc-pg-posture-findings.md` — measured ground. |