Files
oikos/docs/adr/0009-sse-over-websocket.md
dtoro 18cb79caf9 oikos phase 0: ontology + inventory + policy seeds, OpenAPI contract, ADRs
- seeds/ontology.yaml: 59 entity types (5 abstract, is-a hierarchy), 46
  relationship types with cardinality, 6 lifecycles with terminal states
  and named precondition checks
- seeds/inventory.yaml: 110 entities / 142 relationships translated from
  legacy inventory.yaml (fleet, services, ingress, storage, governance,
  archaeology); thin spots marked for backfill
- seeds/policy.yaml: 4 risk classes, 27 approval rules (hierarchy-aware,
  per-entity overrides), autonomy kill-switch off (cold start)
- api/openapi.yaml: full v1 REST contract (40 paths), RFC 9457 errors,
  cursor pagination, idempotency, ETag/If-Match, scopes; redocly-clean
- docs/adr/0001-0010: initial architecture decision records
- scripts/validate-seeds.py: Phase 0 gate — hierarchy, lifecycles,
  endpoints, cardinality, policy cross-refs (0 errors)
- plan: layer CHECK gains 'meta' (root type), cardinality gains
  'many-to-one'

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-07 00:17:15 +02:00

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# ADR 0009 — SSE over WebSocket for the event stream
Status: accepted (2026-07-07) · Plan: rev 3, R3-14
## Context
Live updates (signals, executions, approvals) push server→client only.
Rev 2 specified WebSocket.
## Decision
Server-Sent Events at GET /api/v1/events/stream: plain HTTP (proxies
through Caddy without upgrade handling), native browser EventSource with
auto-reconnect, Last-Event-ID resume backed by the events table. Bounded
per-subscriber buffers with drop-oldest; heartbeat comments every 15s.
Delivery is best-effort — GET /events backfills. Transactional emission +
post-commit LISTEN/NOTIFY feed the stream.
## Consequences
- No bidirectional channel; if one is ever needed (interactive terminals),
add WebSocket alongside — this ADR covers the event feed only.