docs(license): brainstorm spec for license enforcement design
Captures the agreed design for enforcing licensing on cameleer-server: - Default tier with hard caps when no license is configured - Arbitrary per-customer limits in signed Ed25519 license tokens - Standalone cameleer-license-minter module (vendor-only) - DB-persisted license with env/file override paths - ABSENT/ACTIVE/GRACE/EXPIRED state machine; offline expiry only - Removes the dead Feature enum scaffolding Pending writing-plans. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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hsiegeln
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docs/superpowers/specs/2026-04-25-license-enforcement-design.md
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docs/superpowers/specs/2026-04-25-license-enforcement-design.md
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# License Enforcement — Design
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**Date:** 2026-04-25
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**Status:** Approved (brainstorm); pending writing-plans
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**Related:** cameleer-saas#7 (Epic: License & Feature Gating), cameleer-saas#42 (vendor minting), cameleer-saas#50 (customer license view)
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## Problem
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`cameleer-server` ships a license skeleton (`LicenseValidator`, `LicenseGate`, admin endpoint) but
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nothing enforces anything. Open mode (no license configured) currently grants *all* features and
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*no* limits — the opposite of what we want for a self-hosted distribution that needs to gate scale
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behind a paid license.
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We want:
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1. A self-hosted server with **no license** to operate within a small, hard-coded "default tier"
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that is enough to evaluate the product but not enough to run it in production.
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2. Licenses to express **arbitrary per-customer limits** (no fixed tiers) on a vendor-defined set
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of resources: entity counts, compute footprint, retention.
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3. A **standalone minter** owned by the vendor that signs licenses with an Ed25519 private key the
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customer never sees.
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4. Licenses to be **persisted** on the server, **installable** via env var, file, or admin POST,
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and **renewable** by replacement.
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5. **Revocation** handled out of band (vendor suspends the SaaS tenant, or issues short-`exp`
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licenses) — no online revocation callback in v1.
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## Non-goals
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- Feature flags. The current `Feature` enum (topology/lineage/correlation/debugger/replay) is dead
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scaffolding and gets removed; this design is about quantitative limits only.
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- Ingestion-rate limits (executions/minute, logs/minute). Defer to a follow-up.
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- Online revocation. Vendor uses shorter `exp` + reissue; SaaS suspension is independent.
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- Auto-deletion of resources when caps are lowered. Existing rows stay; only new creates reject.
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- Minter keypair generation tooling. Vendor uses standard `openssl genpkey -algorithm ed25519`
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out of band.
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---
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## 1. Architecture
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### 1.1 Module layout
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```
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cameleer-server-core/ (existing — pure domain, no Spring)
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└── license/
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├── LicenseInfo (record — see §2)
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├── LicenseLimits (typed wrapper over the limits map)
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├── LicenseValidator (existing, payload schema updated)
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├── LicenseGate (existing, gutted: no Feature; getLimits() only)
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├── LicenseStateMachine (NEW — pure FSM: ABSENT / ACTIVE / GRACE / EXPIRED)
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└── DefaultTierLimits (constant — §5 numbers)
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cameleer-server-app/ (existing — Spring, web, persistence)
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├── license/
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│ ├── LicenseRepository (NEW — PostgreSQL persistence)
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│ ├── LicenseService (NEW — load/save/replace; emits state events)
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│ ├── LicenseEnforcer (NEW — assertWithinCap entry point)
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│ ├── LicenseUsageReader (NEW — counts current usage for /usage endpoint)
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│ ├── LicenseCapExceededException (NEW — mapped to 403 by ControllerAdvice)
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│ └── LicenseMetrics (NEW — Prometheus gauges)
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├── controller/
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│ ├── LicenseAdminController (existing — extended; persists, audited)
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│ └── LicenseUsageController (NEW — GET /admin/license/usage)
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└── config/
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└── LicenseBeanConfig (existing — extended for DB load order)
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cameleer-license-minter/ (NEW — top-level Maven module)
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├── pom.xml (depends on cameleer-server-core)
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├── LicenseMinter (signing primitive; takes private key + LicenseInfo)
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└── cli/LicenseMinterCli (CLI main class)
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```
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### 1.2 Why a separate `cameleer-license-minter` module
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Not shipped in the runtime JAR. Vendor distributes it independently or builds it from source on a
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trusted machine. Customers never receive it.
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This is module hygiene + smaller runtime attack surface, not a cryptographic protection — license
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forgery requires the vendor's private key, and the public key in the server is enough to verify
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forged tokens regardless of where the minter code lives.
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### 1.3 Dependency graph
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```
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cameleer-license-minter ──▶ cameleer-server-core (LicenseInfo schema only)
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cameleer-server-app ──▶ cameleer-server-core (validator, gate, FSM, defaults)
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cameleer-saas ──▶ cameleer-license-minter (for SaaS-mode minting)
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cameleer-saas ──▶ cameleer-server-core (transitive)
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```
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`cameleer-server-app` has **no** dependency on `cameleer-license-minter`.
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---
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## 2. License envelope
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Wire format unchanged: `base64(payload).base64(ed25519_signature)`. Payload schema:
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```json
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{
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"licenseId": "550e8400-e29b-41d4-a716-446655440000",
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"tenantId": "acme-corp",
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"label": "ACME prod 2026",
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"iat": 1745539200,
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"exp": 1777075200,
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"gracePeriodDays": 30,
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"limits": {
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"max_environments": 5,
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"max_apps": 50,
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"max_agents": 100,
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"max_users": 25,
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"max_outbound_connections": 10,
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"max_alert_rules": 200,
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"max_total_cpu_millis": 32000,
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"max_total_memory_mb": 65536,
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"max_total_replicas": 100,
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"max_execution_retention_days": 90,
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"max_log_retention_days": 30,
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"max_metric_retention_days": 365,
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"max_jar_retention_count": 10
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}
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}
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```
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### 2.1 Field rules
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| Field | Required | Notes |
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|---|---|---|
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| `licenseId` | yes | UUID. Used in audit + future revocation. |
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| `tenantId` | optional | If present and `CAMELEER_SERVER_TENANT_ID` differs, treat as no license + log error. Air-gapped customers may omit. |
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| `label` | optional | Free-form human description. Surfaced in UI. |
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| `iat` | yes | Unix seconds. |
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| `exp` | yes | Unix seconds. |
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| `gracePeriodDays` | optional, default `0` | Days `exp` may be in the past while limits still apply. |
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| `limits.*` | each optional | Missing key inherits from `DefaultTierLimits`. A license can lift any subset. |
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### 2.2 Removed from the current envelope
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- `tier` (string) — was a non-functional label. Folded into `label`.
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- `features` (array) — out of scope. `Feature` enum deleted.
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---
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## 3. License state machine
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```
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exp + grace passes
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┌─────────┐ install valid ┌────────┐ exp ┌────────┐ ────────► ┌─────────┐
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│ ABSENT │ ───────────────▶│ ACTIVE │──────▶│ GRACE │ │ EXPIRED │
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└─────────┘ └────────┘ └────────┘ └─────────┘
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▲ │ │ ▲ │
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│ install invalid │ replace │ │ replace valid │ replace
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│ (sig/tenant/parse) ▼ │ │ ▼
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└────────────────────────────┴──────────────┴─┴───────────────────┘
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all transitions persist + audit-log
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```
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### 3.1 State semantics
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| State | Effective limits | Trigger |
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|---|---|---|
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| `ABSENT` | `DefaultTierLimits` | No DB row, or signature/tenant/parse failure. |
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| `ACTIVE` | `merge(default, license.limits)` | License loaded, `now < exp`. |
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| `GRACE` | Same as `ACTIVE` | `exp ≤ now < exp + gracePeriodDays`. UI banner. |
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| `EXPIRED` | `DefaultTierLimits` | `now ≥ exp + gracePeriodDays`. Distinct UI label vs ABSENT. |
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State is recomputed on every limit check (clock comparison only) — no scheduler needed for
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transitions. The only "background" behaviour is the Prometheus gauge refresh.
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### 3.2 Default tier (the "no license" caps)
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| Limit | Default |
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|---|---|
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| `max_environments` | 1 |
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| `max_apps` | 3 |
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| `max_agents` | 5 |
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| `max_users` | 3 |
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| `max_outbound_connections` | 1 |
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| `max_alert_rules` | 2 |
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| `max_total_cpu_millis` | 2000 (2 cores) |
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| `max_total_memory_mb` | 2048 (2 GB) |
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| `max_total_replicas` | 5 |
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| `max_execution_retention_days` | 1 |
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| `max_log_retention_days` | 1 |
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| `max_metric_retention_days` | 1 |
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| `max_jar_retention_count` | 3 |
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Encoded as `public static final Map<String, Integer> DEFAULTS` in `DefaultTierLimits`. Keys
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match the license payload exactly.
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---
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## 4. Enforcement map
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Every limit check goes through one method on `LicenseEnforcer`:
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```java
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void assertWithinCap(String limitKey, long currentUsage, long requestedDelta);
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```
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Throws `LicenseCapExceededException(limitKey, current, cap)` when `currentUsage + requestedDelta > cap`.
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A `@ControllerAdvice` maps it to `403` with body
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`{"error":"license cap reached","limit":"max_apps","current":3,"cap":3}`.
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| Limit | Call site | Failure response |
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|---|---|---|
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| `max_environments` | `EnvironmentService.create` (start) | 403 |
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| `max_apps` | `AppService.createApp` | 403 |
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| `max_agents` | `AgentRegistryService.register` | 403 — agent treated as unregistered (no SSE, no commands) |
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| `max_users` | `UserAdminController.createUser` and `OidcAuthController.callback` (auto-signup) | 403 / OIDC login failure |
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| `max_outbound_connections` | `OutboundConnectionServiceImpl.create` | 403 |
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| `max_alert_rules` | `AlertRuleController.create` | 403 |
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| `max_total_cpu_millis` | `DeploymentExecutor.PRE_FLIGHT` (sum across non-stopped deploys + new) | Deploy fails fast at PRE_FLIGHT, status FAILED, audit row |
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| `max_total_memory_mb` | same | same |
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| `max_total_replicas` | same | same |
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| `max_execution_retention_days` | `EnvironmentService.update` (per-env field, see §4.1) + `ClickHouseSchemaInitializer.applyRetention()` at boot | 422 on update; boot pins effective TTL = `min(licenseCap, configured)` |
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| `max_log_retention_days` | same | same |
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| `max_metric_retention_days` | same | same |
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| `max_jar_retention_count` | `EnvironmentAdminController.PUT /jar-retention` | 422 |
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### 4.1 Per-environment retention fields
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Three new columns on `environments` (Flyway V2):
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```sql
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ALTER TABLE environments
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ADD COLUMN execution_retention_days INTEGER NOT NULL DEFAULT 1,
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ADD COLUMN log_retention_days INTEGER NOT NULL DEFAULT 1,
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ADD COLUMN metric_retention_days INTEGER NOT NULL DEFAULT 1;
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```
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These are the configured per-env values. The effective ClickHouse TTL is
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`min(licenseCap, configured)`, applied at startup by `ClickHouseSchemaInitializer`. Admin UI
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surfaces the configured values; `EnvironmentService.update` rejects values above the license cap
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with 422.
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### 4.2 Boot-time invariant
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If a license is added that *lowers* a cap below current usage (10 apps, license now allows 5), the
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server logs one WARN per limit at boot. **No deletion**. New creates reject; existing resources
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keep working.
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---
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## 5. Usage endpoint
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`GET /api/v1/admin/license/usage` (ADMIN only):
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```json
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{
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"state": "ACTIVE",
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"expiresAt": "2027-04-25T00:00:00Z",
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"daysRemaining": 365,
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"gracePeriodDays": 30,
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"tenantId": "acme-corp",
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"label": "ACME prod 2026",
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"limits": [
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{"key": "max_apps", "current": 7, "cap": 50, "source": "license"},
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{"key": "max_agents", "current": 12, "cap": 100, "source": "license"},
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{"key": "max_total_cpu_millis", "current": 8500, "cap": 32000, "source": "license"},
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{"key": "max_outbound_connections", "current": 0, "cap": 1, "source": "default"}
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]
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}
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```
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`source` is `"default"` when the cap comes from `DefaultTierLimits` (i.e. the license omits this
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key, or there is no license), and `"license"` when the cap is explicit in the license. Drives the
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SaaS UI's "free tier" badge.
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`LicenseUsageReader` issues one cheap aggregate per limit (`SELECT COUNT(*)` per entity table; a
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single grouped `SELECT SUM(replicas * cpuMillis), SUM(replicas * memoryMb), SUM(replicas)` over
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non-stopped deployments).
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`GET /api/v1/admin/license` (existing) is extended to return `{state, envelope}` with the raw token
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omitted from the response.
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---
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## 6. Lifecycle, persistence, install paths
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### 6.1 Storage
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Flyway V2 migration:
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```sql
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CREATE TABLE license (
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tenant_id TEXT PRIMARY KEY, -- one row per server (= one tenant)
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token TEXT NOT NULL, -- full signed token
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license_id UUID NOT NULL,
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installed_at TIMESTAMPTZ NOT NULL,
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installed_by TEXT NOT NULL, -- users.user_id (bare) or 'system' for env/file boot
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expires_at TIMESTAMPTZ NOT NULL
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);
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```
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### 6.2 Boot order
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`LicenseBeanConfig`:
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1. If `CAMELEER_SERVER_LICENSE_TOKEN` env var is set → validate → write to DB (overwrite) →
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load.
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2. Else if `CAMELEER_SERVER_LICENSE_FILE` is set → read file → validate → write to DB → load.
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3. Else read `license` row from DB → validate → load.
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4. Else `ABSENT`.
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Env-var / file act as **idempotent overrides** — they always win and replace the DB row, so the
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operator's last action survives reboots.
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### 6.3 Runtime install
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`POST /api/v1/admin/license { "token": "..." }` (existing):
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- Validates against the configured public key.
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- On success, persists to `license` table (`installed_by = user_id`), updates the in-memory
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`LicenseGate`, audits.
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- On failure, returns 400 with the validator error message and audits the rejection.
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### 6.4 Public key custody
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`CAMELEER_SERVER_LICENSE_PUBLICKEY` (existing) remains the only verification key. Build- /
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deploy-time secret bound to the vendor distribution. **Not stored in DB.** If unset *and* a
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license is present → reject all licenses (existing behaviour).
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### 6.5 Audit trail
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New `AuditCategory.LICENSE`. Actions:
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| Action | When | Payload |
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|---|---|---|
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| `install_license` | First successful install in an empty state | `{licenseId, expiresAt, installedBy, source}` (`source` = `env`/`file`/`api`) |
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| `replace_license` | Successful install over an existing license | same + `previousLicenseId` |
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| `reject_license` | Validation failed (signature, tenant, parse, public key missing) | `{reason, source}` |
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| `cap_exceeded` | Any `LicenseCapExceededException` | `{limit, current, cap, requestedBy}` |
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---
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## 7. Minter
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### 7.1 `LicenseMinter` (library)
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Pure function, packaged in `cameleer-license-minter`:
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```java
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public final class LicenseMinter {
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public static String mint(LicenseInfo info, PrivateKey ed25519PrivateKey);
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}
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```
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Serializes `LicenseInfo` to canonical JSON (sorted keys), signs the bytes with Ed25519, returns
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`base64(payload).base64(signature)`. cameleer-saas calls this directly to mint per-tenant tokens.
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### 7.2 `LicenseMinterCli` (CLI)
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```bash
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java -jar cameleer-license-minter-1.0-SNAPSHOT.jar \
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--private-key=/secure/vendor.key \
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--tenant=acme-corp \
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--label="ACME prod 2026" \
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--expires=2027-04-25 \
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--grace-days=30 \
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--max-apps=50 \
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--max-agents=100 \
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--max-total-cpu-millis=32000 \
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--max-total-memory-mb=65536 \
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--max-execution-retention-days=90 \
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--output=acme-license.tok
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```
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- `--private-key` reads a PEM-encoded Ed25519 private key (output of
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`openssl genpkey -algorithm ed25519`).
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- Unspecified `--max-*` flags are omitted from the payload — the license inherits the default for
|
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that key.
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- Unknown flags fail fast.
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- `--output` writes the token; if omitted, prints to stdout.
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Keypair generation is **out of band** — vendor uses `openssl` and stores both halves in their
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secret manager. We deliberately do not ship a `--gen-keypair` subcommand to keep the boundary
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clean.
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||||
|
||||
---
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||||
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## 8. Telemetry
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||||
|
||||
Prometheus gauges scraped via `/api/v1/prometheus`:
|
||||
|
||||
| Metric | Labels | Notes |
|
||||
|---|---|---|
|
||||
| `cameleer_license_state` | `state="ABSENT|ACTIVE|GRACE|EXPIRED"` | Boolean — exactly one is 1. |
|
||||
| `cameleer_license_days_remaining` | (none) | Negative in GRACE/EXPIRED. |
|
||||
| `cameleer_license_limit_utilisation`| `limit="max_apps"` etc. | `current / cap`, in `[0, 1+]`. |
|
||||
| `cameleer_license_cap_rejections_total` | `limit="..."` | Counter. |
|
||||
|
||||
State-transition log lines: `INFO` on install/ACTIVE, `WARN` on GRACE, `ERROR` on EXPIRED, `WARN`
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||||
on cap reject (sampled to avoid log spam).
|
||||
|
||||
---
|
||||
|
||||
## 9. Dead-code removal
|
||||
|
||||
Performed in the **first commit** of the implementation. Per the project's "no backwards
|
||||
compatibility shims" preference, no deprecated path or feature flag.
|
||||
|
||||
- Delete `Feature.java`.
|
||||
- Delete `LicenseGate.isEnabled(Feature)`.
|
||||
- Delete `LicenseInfo.features` field, `LicenseInfo.hasFeature(Feature)`.
|
||||
- Delete `LicenseGateTest.withLicense_onlyLicensedFeaturesEnabled` and `LicenseInfo.open()`'s
|
||||
`Set.of(Feature.values())` assertion.
|
||||
- Update `LicenseValidator` to ignore `features` if present in old tokens (silently dropped,
|
||||
not an error).
|
||||
|
||||
---
|
||||
|
||||
## 10. Testing
|
||||
|
||||
| Layer | Tests |
|
||||
|---|---|
|
||||
| Core unit | `LicenseValidatorTest` — signature, expiry, tenant mismatch, missing required fields, unknown extra fields. |
|
||||
| Core unit | `LicenseStateMachineTest` — all four transitions including grace boundary, replace from any state, invalid install. |
|
||||
| Core unit | `DefaultTierLimitsTest` — every documented key has a default. |
|
||||
| Minter unit | `LicenseMinterTest` — round-trip with a throwaway Ed25519 keypair. Canonical JSON is stable across runs. |
|
||||
| Minter CLI | `LicenseMinterCliTest` — invokes `main` with `--private-key=tmp` and checks output token validates. |
|
||||
| App unit | `LicenseEnforcerTest` — for each limit: cap-reached, under-cap, default-tier with no license, missing-cap-inherits-default. |
|
||||
| App integration | `LicenseLifecycleIT` — install via env, replace via POST, restart restores from DB. Driven through REST. |
|
||||
| App integration | `LicenseEnforcementIT` — REST-driven, hit each cap end-to-end (per the project's "REST-API-driven ITs" preference). Includes `cap_exceeded` audit row check. |
|
||||
| Boot | `SchemaBootstrapIT` extension — `license` table exists, `environments` retention columns exist, retention pinning honoured at boot. |
|
||||
|
||||
No raw-SQL seeding of caps in ITs. All caps installed via the REST endpoint or env var.
|
||||
|
||||
---
|
||||
|
||||
## 11. Open follow-ups (deliberately deferred)
|
||||
|
||||
- Ingestion-rate limits (`max_executions_per_minute`, `max_logs_per_minute`).
|
||||
- Online revocation callback (the `revocation_check_url` envelope field).
|
||||
- Concurrent debug session limit (`max_concurrent_debug_sessions` from the SaaS epic).
|
||||
- A "license usage history" report for vendors to see growth over time.
|
||||
- Open a tracking issue on `cameleer/cameleer-server` (Gitea) — none exists today.
|
||||
|
||||
---
|
||||
|
||||
## 12. Risk register
|
||||
|
||||
| Risk | Mitigation |
|
||||
|---|---|
|
||||
| Default tier so tight that an honest evaluator cannot try the product. | Defaults documented; vendor can ship a longer-`exp` "trial" license at install time if needed. |
|
||||
| Customer lowers `gracePeriodDays` field by editing token. | Token is signed; any edit invalidates the signature. |
|
||||
| License removed from DB out of band, server lands in ABSENT and rejects new resources but old ones are above default tier. | Boot-time WARN per over-cap limit. UI banner in the admin license page. No auto-deletion. |
|
||||
| Public key rotation. | Out of scope for v1; documented as "redeploy with new key" — vendors are expected to rotate via redeployment. |
|
||||
| Compute cap arithmetic relies on `cpuLimit` and `memoryLimitMb` being set on every container. | Existing `ResolvedContainerConfig` already enforces these; `DeploymentExecutor.PRE_FLIGHT` rejects deploys with unset compute fields. |
|
||||
| Per-env retention column added but old ClickHouse partitions retain longer. | Documented: TTL change is honoured by ClickHouse on its next merge cycle. New rows inserted always honour the new TTL. |
|
||||
Reference in New Issue
Block a user