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* feat: complete multi-tenant isolation — per-user budgets, model selection, heartbeat cycling Finishes the remaining isolation work from phases 2–4 of #59: Phase 2 (DB scoping): Fix /status and /list commands to use _for_user DB variants instead of global queries that leaked cross-user job data. Phase 3 (Runtime isolation): Per-user workspace in routine engine's spawn_fire so lightweight routines run in the correct user context. Per-user daily cost tracking in CostGuard with configurable budget via MAX_COST_PER_USER_PER_DAY_CENTS. Multi-user heartbeat that cycles through all users with routines, auto-detected from GATEWAY_USER_TOKENS. Phase 4 (Provider/tools): Per-user model selection via preferred_model setting — looked up from SettingsStore on first iteration, threaded through ReasoningContext.model_override to CompletionRequest. Works with providers that support per-request model overrides (NearAI). Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * fix: use selected_model setting key to match /model command persistence The dispatcher was reading "preferred_model" but the /model command (merged from staging) persists to "selected_model". Since set_setting is already per-user scoped, using the same key makes /model work as the per-user model override in multi-tenant mode. Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * fix: heartbeat hygiene, /model multi-tenant guard, RigAdapter model override Three follow-up fixes for multi-tenant isolation: 1. Multi-user heartbeat now runs memory hygiene per user before each heartbeat check, matching single-user heartbeat behavior. 2. /model command in multi-tenant mode only persists to per-user settings (selected_model) without calling set_model() on the shared LlmProvider. The per-request model_override in the dispatcher reads from the same setting. Added multi_tenant flag to AgentConfig (auto-detected from GATEWAY_USER_TOKENS). 3. RigAdapter now supports per-request model overrides by injecting the model name into rig-core's additional_params. OpenAI/Anthropic/Ollama API servers use last-key-wins for duplicate JSON keys, so the override takes effect via serde's flatten serialization order. Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * fix: address PR review — cost model attribution, heartbeat concurrency, pruning Fixes from review comments on #1614: - Cost tracking now uses the override model name (not active_model_name) when a per-user model override is active, for accurate attribution. - Multi-user heartbeat runs per-user checks concurrently via JoinSet instead of sequentially, preventing one slow user from blocking others. - Per-user failure counts tracked independently; users exceeding max_failures are skipped (matching single-user semantics). - per_user_daily_cost HashMap pruned on day rollover to prevent unbounded growth in long-lived deployments. - Doc comment fixed: says "routines" not "active routines". Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * fix: /status ownership, model persistence scoping, heartbeat robustness Addresses second round of PR review on #1614: - /status <job_id> DB path now validates job.user_id == requesting user before returning data (was missing ownership check, security fix). - persist_selected_model takes user_id param instead of owner_id, and skips .env/TOML writes in multi-tenant mode (these are shared global files). handle_system_command now receives user_id from caller. - JoinSet collection handles Err(JoinError) explicitly instead of silently dropping panicked tasks. - Notification forwarder extracts owner_id from response metadata in multi-tenant mode for per-user routing instead of broadcasting to the agent owner. Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * fix: cost pricing, fire_manual workspace, heartbeat concurrency cap Round 3 review fixes: - Cost tracking passes None for cost_per_token when model override is active, letting CostGuard look up pricing by model name instead of using the default provider's rates (serrrfirat). - fire_manual() now uses per-user workspace, matching spawn_fire() pattern (serrrfirat). - Removed MULTI_TENANT env var — multi-tenant mode is auto-detected solely from GATEWAY_USER_TOKENS presence (serrrfirat + Copilot). - Multi-user heartbeat capped at 8 concurrent tasks to avoid flooding the LLM provider (serrrfirat + Copilot). - Fixed inject_model_override doc comment accuracy (Copilot). - Added comment explaining multi-tenant notification routing priority (Copilot). Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * feat: user-scoped webhook endpoint for multi-tenant isolation Adds POST /api/webhooks/u/{user_id}/{path} — a user-scoped webhook endpoint that filters the routine lookup by user_id, preventing cross-user webhook triggering when paths collide. The existing /api/webhooks/{path} endpoint remains unchanged for backward compatibility in single-user deployments. Changes: - get_webhook_routine_by_path gains user_id: Option<&str> param - Both postgres and libsql implementations add AND user_id = ? filter when user_id is provided - New webhook_trigger_user_scoped_handler extracts (user_id, path) from URL and passes to shared fire_webhook_inner logic - Route registered on public router (webhooks are called by external services that can't send bearer tokens) Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * feat: add TenantCtx for compile-time tenant isolation Implements zmanian's architectural proposal from #1614 review: two-tier scoped database access (TenantScope/AdminScope) so handler code cannot accidentally bypass tenant scoping. TenantScope (default): wraps user_id + Arc<dyn Database>, auto-binds user_id on every operation. ID-based lookups return None for cross- tenant resources. No escape hatch — forgetting to scope is a compile error. AdminScope (explicit opt-in): cross-tenant access for system-level components (heartbeat, routine engine, self-repair, scheduler, worker). TenantCtx bundles TenantScope + workspace + cost guard + per-user rate limiting. Constructed once per request in handle_message, threaded through all command handlers and ChatDelegate. Key changes: - New src/tenant.rs (~920 lines): TenantScope, AdminScope, TenantCtx, TenantRateState, TenantRateRegistry - All command handlers: user_id: &str → ctx: &TenantCtx - ChatDelegate: cost check/record/settings via self.tenant - System components: store field changed to AdminScope - Config: TENANT_MAX_LLM_CONCURRENT, TENANT_MAX_JOBS_CONCURRENT env vars - Fixes bug: /status <job_id> cross-tenant leak (now auto-filtered) Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> --------- Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>