Ring:migrating To Lib Systemplane

Systemplane Migration (lib-systemplane)

When to use

• User requests systemplane integration for a Go service
• User asks to add hot-reloadable runtime configuration
• Task mentions "systemplane", "runtime config", "hot reload", "LISTEN/NOTIFY config", "admin.Mount"
• User asks to migrate from v4 systemplane to v5

Skip when

• Service is not a Go project
• Task does not involve runtime configuration
• Service has zero hot-reloadable knobs (everything is static env-var-at-startup config)
• Task is documentation-only or non-code

You orchestrate. Agents implement. NEVER use Edit/Write/Bash on Go source files. All code changes go through Task(subagent_type="ring:backend-go"). TDD mandatory for all implementation gates (RED → GREEN → REFACTOR).

Systemplane Architecture

Three-step lifecycle:

1. systemplane.NewPostgres / systemplane.NewMongoDB — construct client (pass open *sql.DB or *mongo.Client)
2. client.Register(namespace, key, defaultValue, opts...) — declare every key BEFORE Start
3. client.Start(ctx) — begin listening; Get* for reads, OnChange for reactions

Standards reference: WebFetch https://raw.githubusercontent.com/LerianStudio/lib-systemplane/main/doc.go

Canonical import paths:

Legacy paths are DELETED — do not use lib-commons/v4/... or lib-commons/v5/commons/systemplane (extracted to its own module), and do not use Supervisor, BundleFactory, ApplyBehavior.

Provisioning is migration-only. lib-systemplane publishes systemplane.SchemaSQL() + systemplane.DefaultSeedSQL() as public artifacts and consumers MUST fold them into the service's own SQL migration pipeline via the make systemplane-ddl generator pattern (Gate 3.5). Runtime DDL provisioning is FORBIDDEN — least-privilege tenant-manager roles cannot run DDL anyway, and any boot-time runSchema-style hook is a CRITICAL deviation.

Scope: operational knobs only — values that can mutate in-place (log levels, feature flags, rate limits, timeouts, poll intervals). NOT for settings requiring resource teardown: DSNs, TLS material, listen addresses → keep in env vars + restart.

Redaction policies for Register:

Any key storing credentials MUST use RedactFull.

Admin mount requires custom authorizer (admin.WithAuthorizer) — default is DENY-ALL.

Mandatory agent instruction (include in EVERY dispatch):

WebFetch https://raw.githubusercontent.com/LerianStudio/lib-systemplane/main/doc.go. Use only canonical github.com/LerianStudio/lib-systemplane import paths. v4 packages and the legacy lib-commons/v5/commons/systemplane path no longer exist. systemplane is for operational knobs only — not DSNs, TLS, or listen addresses. Provisioning is migration-only (Gate 3.5). Wire cmd/generate-systemplane-ddl/ + make systemplane-ddl + check-systemplane-ddl-drift + migrations/systemplane_ddl_manifest.json and a bootstrap seam returning []SystemplaneSeedEntry. NEVER call SchemaSQL() at boot. NEVER hand-edit generated migrations/NNN_systemplane_*.sql. See multi-tenant.md §27 "Cold-tenant resolution" for the canonical reference. TDD: RED → GREEN → REFACTOR for every gate.

Related Skills

• [[using-lib-systemplane]] — adoption sweep + API reference for the lib-systemplane module
• [[using-lib-commons]] — non-observability lib-commons packages (lifecycle, outbox, tenancy)
• [[using-lib-observability]] — tracing, metrics, logging, assert, runtime, redaction
• For services running in multi-tenant mode (MULTI_TENANT_ENABLED=true), the consumer-side pattern (registration shape, no-fallback consumer reads, DI interface, make systemplane-ddl provisioning generator, Manager binding when available in the pinned lib version) is documented in dev-team/docs/standards/golang/multi-tenant.md §27 "Systemplane in MT mode — compliance pattern (MANDATORY)". Load that section — particularly the "Cold-tenant resolution — make systemplane-ddl generator" subsection — in addition to the general systemplane architecture below.

Gate Overview

Gates execute sequentially. Any existing v4 code = NON-COMPLIANT = gates cannot be skipped.

Gate 0: Stack Detection

Orchestrator executes directly. Three phases:

Phase 1: Stack Detection

grep "lib-commons\|lib-systemplane" go.mod  # check legacy v4/v5 paths vs new module
grep -rn "systemplane" internal/             # existing usage
grep -rn "SYSTEMPLANE_" .                    # v4 env vars
grep "postgresql\|postgres" go.mod           # backend type
grep "mongodb\|mongo" go.mod
# Non-canonical:
grep -rn "fsnotify\|viper.Watch\|Supervisor\|BundleFactory\|ApplyBehavior" internal/
grep -rn "lib-commons/v5/commons/systemplane\|lib-commons/v4" internal/  # legacy paths
# DDL provisioning seam + manifest (Gate 3.5):
ls cmd/generate-systemplane-ddl/                              # generator presence
ls migrations/systemplane_ddl_manifest.json                    # append-only manifest
grep -n "systemplane-ddl\|check-systemplane-ddl-drift" Makefile  # make targets
grep -rn "SystemplaneSeedEntries\|buildSystemplaneRegistrations" internal/bootstrap/  # seam
# Runtime DDL anti-pattern (CRITICAL):
grep -rn "runSchema\|SchemaSQL()\|CREATE TABLE.*systemplane_entries" internal/  # MUST be migration-only

Phase 2: Compliance Audit (if systemplane code detected)

• No legacy imports (lib-commons/v4/..., lib-commons/v5/commons/systemplane)
• Register called before Start
• OnChange wired for hot-reloadable keys
• admin.Mount with admin.WithAuthorizer
• Lifecycle: client.Start(ctx) registered with commons.Launcher
• cmd/generate-systemplane-ddl/ generator present AND migrations/systemplane_ddl_manifest.json committed
• make systemplane-ddl + check-systemplane-ddl-drift wired in Makefile and called from check-generated-artifacts
• Bootstrap exposes the seam SystemplaneSeedEntries() ([]SystemplaneSeedEntry, error) derived from the same buildSystemplaneRegistrations (or equivalent) the client uses at boot
• ZERO runtime DDL — no runSchema, no SchemaSQL() at boot, no CREATE TABLE ... systemplane_entries outside migrations/

Phase 3: Non-Canonical Detection

• Any fsnotify / viper.WatchConfig / envconfig.Watch for runtime config → MUST replace
• Any v4 sub-packages (domain/, ports/, registry/, service/, bootstrap/) → MUST remove
• Any lib-commons/v5/commons/systemplane imports → MUST migrate to lib-systemplane
• Runtime DDL provisioning (boot-time SchemaSQL() execution) → MUST replace with the make systemplane-ddl migration pipeline (Gate 3.5)
• Hand-written migrations/NNN_systemplane_*.sql files NOT emitted by the generator → MUST be re-emitted via make systemplane-ddl (drift-guarded)

Severity Reference