Reduce hot run polling pressure

platform/README.md

@@ -47,7 +47,7 @@ Runtime configuration:
 - `PLATFORM_STORAGE_BACKEND`: storage backend, default `file`; use `memory` only for tests or disposable local runs.
 - `PLATFORM_MYSQL_DSN`: MySQL DSN used when `PLATFORM_STORAGE_BACKEND=mysql`, for example `platform:platform@tcp(127.0.0.1:3306)/platform?parseTime=true`.
 - `PLATFORM_DATA_DIR`: default platform data directory, default `.platform-data`.
-- `PLATFORM_METADATA_PATH`: file-backed metadata snapshot path, default `.platform-data/metadata.json`.
+- `PLATFORM_METADATA_PATH`: file-backed metadata snapshot path, default `.platform-data/metadata.json`; high-frequency Run endpoint/session state uses a sibling runtime snapshot to avoid rewriting the full metadata file on every heartbeat.
 - `PLATFORM_LOG_BODY_BACKEND`: log body backend, default follows metadata backend except MySQL uses `file`; supported values are `file` and `memory`.
 - `PLATFORM_LOG_DIR`: segmented log body directory, default `.platform-data/logs`.
 - `PLATFORM_ARTIFACT_DIR`: private durable artifact body/transfer directory, default `.platform-data/artifacts`.

platform/api/resource_handlers.go

@@ -2437,14 +2437,19 @@ func (h *coreHandlers) runEndpointDetail(w http.ResponseWriter, r *http.Request)
 func (h *coreHandlers) jobs(w http.ResponseWriter, r *http.Request) {
 	switch r.Method {
 	case http.MethodGet:
+		limit, err := optionalPositiveInt(r.URL.Query().Get("limit"))
+		if err != nil || limit < 0 {
+			writeAPIError(w, http.StatusBadRequest, errorCodeBadRequest, "invalid job limit", nil)
+			return
+		}
 		filter := domain.JobFilter{
 			ServerInstanceID: r.URL.Query().Get("serverInstanceId"),
 			RunEndpointID:    r.URL.Query().Get("runEndpointId"),
 			State:            domain.JobState(r.URL.Query().Get("state")),
 			States:           parseJobStates(r.URL.Query().Get("states")),
+			Limit:            limit,
 		}
 		var jobs []domain.Job
-		var err error
 		if h.enforceAuthorization {
 			jobs, err = h.core.ListJobsForSession(bearerToken(r), filter)
 		} else {

platform/api/resource_handlers_test.go

@@ -88,6 +88,8 @@ func TestCoreAPICreateListDetailWorkflows(t *testing.T) {
 	assertListCount(t, jobs.Count, 1)
 	jobs = getJSON[dto.JobListResponse](t, router, "/api/v1/jobs?serverInstanceId=server-1&states=queued,running,failed")
 	assertListCount(t, jobs.Count, 1)
+	jobs = getJSON[dto.JobListResponse](t, router, "/api/v1/jobs?serverInstanceId=server-1&states=queued,running,failed&limit=1")
+	assertListCount(t, jobs.Count, 1)
 	jobs = getJSON[dto.JobListResponse](t, router, "/api/v1/jobs?serverInstanceId=server-1&states=running,failed")
 	assertListCount(t, jobs.Count, 0)
 

platform/api/routes.md

@@ -38,7 +38,7 @@ Plugin-owned data is an independent, server-scoped plugin store. It is not a pro
 - `GET /api/v1/metrics/server-instances`
 - `GET /api/v1/run/endpoints?status=online`
 - `GET /api/v1/jobs?serverInstanceId=server-1&runEndpointId=run-local&state=queued`
-- `GET /api/v1/jobs?serverInstanceId=server-1&states=queued,running,failed`
+- `GET /api/v1/jobs?serverInstanceId=server-1&states=queued,running,failed&limit=100`
 - `GET /api/v1/artifacts?ownerKind=job&ownerId=job-1&state=uploading`
 - `GET /api/v1/log-streams?serverInstanceId=server-1&streamKey=stdout`
 
@@ -181,7 +181,7 @@ Control is the highest-priority run-facing channel; artifact/file transfer press
 - `POST /api/v1/run/jobs/reconcile`: accept persisted Run journal evidence (`jobId`, `attempt`, `leaseToken`), rebind only matching active attempts to the current authenticated session generation, persist reconciliation metadata, retry/cancel platform-active missing work, and return confirmed assignments plus discard IDs.
 - `POST /api/v1/jobs/{id}/cancel`: authorize the server owner/administrator or platform administrator and durably record cancellation intent; queued/retrying work becomes cancelled immediately while active work completes through fenced Run polling/result.
 
-Run job actions carry bounded job metadata only: job ID, run endpoint ID, server instance ID, capability, idempotency key, lease token, attempt/retry limits, deadlines, progress, terminal state, message, error code, result reference, and timing hints. Raw lease tokens exist only on the signed Run job channel; platform persistence stores their hashes. User-facing Job responses expose safe attempt, retry, cancel, terminal, and reconcile projections but never raw/hashed leases, Run sessions, secret refs, host paths, sockets, or credentials.
+Run job actions carry bounded job metadata only: job ID, run endpoint ID, server instance ID, capability, idempotency key, lease token, attempt/retry limits, deadlines, progress, terminal state, message, error code, result reference, and timing hints. Raw lease tokens exist only on the signed Run job channel; platform persistence stores their hashes. User-facing Job detail responses expose safe execution-result evidence; Job list responses stay summary-only for hot console polling. Job responses never expose raw/hashed leases, Run sessions, secret refs, host paths, sockets, or credentials.
 Job ack/progress/result/cancel/reconcile calls remain lightweight and independently valid while log batches or artifact/file chunks are queued, slow, or retrying. Equivalent duplicate terminal results remain idempotent under channel pressure.
 
 ## Implemented Run File Transfer Actions

platform/domain/resources.go

@@ -1597,6 +1597,7 @@ type JobFilter struct {
 	RunEndpointID    string
 	State            JobState
 	States           []JobState
+	Limit            int
 }
 
 type ArtifactFilter struct {

platform/dto/resources.go

@@ -888,31 +888,31 @@ type JobRetryPolicyResponse struct {
 }
 
 type JobResponse struct {
-	ID                string                     `json:"id"`
-	ServerInstanceID  string                     `json:"serverInstanceId,omitempty"`
-	RunEndpointID     string                     `json:"runEndpointId"`
-	Capability        string                     `json:"capability"`
-	TargetKey         string                     `json:"targetKey,omitempty"`
-	InputRef          string                     `json:"inputRef,omitempty"`
-	IdempotencyKey    string                     `json:"idempotencyKey"`
-	State             domain.JobState            `json:"state"`
-	Progress          JobProgressBody            `json:"progress"`
-	ResultRef         string                     `json:"resultRef,omitempty"`
-	ExecutionResult   JobExecutionResultResponse `json:"executionResult,omitempty"`
-	RetryPolicy       JobRetryPolicyResponse     `json:"retryPolicy"`
-	Attempt           int                        `json:"attempt"`
-	NextAttemptAt     *time.Time                 `json:"nextAttemptAt,omitempty"`
-	AckDeadlineAt     *time.Time                 `json:"ackDeadlineAt,omitempty"`
-	LeaseExpiresAt    *time.Time                 `json:"leaseExpiresAt,omitempty"`
-	CancelReason      string                     `json:"cancelReason,omitempty"`
-	CancelRequestedAt *time.Time                 `json:"cancelRequestedAt,omitempty"`
-	CancelCompletedAt *time.Time                 `json:"cancelCompletedAt,omitempty"`
-	TerminalAt        *time.Time                 `json:"terminalAt,omitempty"`
-	LastReconciledAt  *time.Time                 `json:"lastReconciledAt,omitempty"`
-	ReconcileCount    int                        `json:"reconcileCount"`
-	ReconcileOutcome  string                     `json:"reconcileOutcome,omitempty"`
-	CreatedAt         time.Time                  `json:"createdAt"`
-	UpdatedAt         time.Time                  `json:"updatedAt"`
+	ID                string                      `json:"id"`
+	ServerInstanceID  string                      `json:"serverInstanceId,omitempty"`
+	RunEndpointID     string                      `json:"runEndpointId"`
+	Capability        string                      `json:"capability"`
+	TargetKey         string                      `json:"targetKey,omitempty"`
+	InputRef          string                      `json:"inputRef,omitempty"`
+	IdempotencyKey    string                      `json:"idempotencyKey"`
+	State             domain.JobState             `json:"state"`
+	Progress          JobProgressBody             `json:"progress"`
+	ResultRef         string                      `json:"resultRef,omitempty"`
+	ExecutionResult   *JobExecutionResultResponse `json:"executionResult,omitempty"`
+	RetryPolicy       JobRetryPolicyResponse      `json:"retryPolicy"`
+	Attempt           int                         `json:"attempt"`
+	NextAttemptAt     *time.Time                  `json:"nextAttemptAt,omitempty"`
+	AckDeadlineAt     *time.Time                  `json:"ackDeadlineAt,omitempty"`
+	LeaseExpiresAt    *time.Time                  `json:"leaseExpiresAt,omitempty"`
+	CancelReason      string                      `json:"cancelReason,omitempty"`
+	CancelRequestedAt *time.Time                  `json:"cancelRequestedAt,omitempty"`
+	CancelCompletedAt *time.Time                  `json:"cancelCompletedAt,omitempty"`
+	TerminalAt        *time.Time                  `json:"terminalAt,omitempty"`
+	LastReconciledAt  *time.Time                  `json:"lastReconciledAt,omitempty"`
+	ReconcileCount    int                         `json:"reconcileCount"`
+	ReconcileOutcome  string                      `json:"reconcileOutcome,omitempty"`
+	CreatedAt         time.Time                   `json:"createdAt"`
+	UpdatedAt         time.Time                   `json:"updatedAt"`
 }
 
 type JobExecutionResultResponse struct {
@@ -1990,6 +1990,18 @@ func RunEndpointListFromDomain(endpoints []domain.RunEndpoint) RunEndpointListRe
 }
 
 func JobFromDomain(job domain.Job) JobResponse {
+	return jobResponseFromDomain(job, true)
+}
+
+func JobListItemFromDomain(job domain.Job) JobResponse {
+	return jobResponseFromDomain(job, false)
+}
+
+func jobResponseFromDomain(job domain.Job, includeExecutionResult bool) JobResponse {
+	var executionResult *JobExecutionResultResponse
+	if includeExecutionResult {
+		executionResult = jobExecutionResultFromDomain(job.ExecutionResult)
+	}
 	return JobResponse{
 		ID:               job.ID,
 		ServerInstanceID: job.ServerInstanceID,
@@ -2001,7 +2013,7 @@ func JobFromDomain(job domain.Job) JobResponse {
 		State:            job.State,
 		Progress:         progressFromDomain(job.Progress),
 		ResultRef:        job.ResultRef,
-		ExecutionResult:  JobExecutionResultResponse{Kind: job.ExecutionResult.Kind, ProcessState: job.ExecutionResult.ProcessState, ExitClassification: job.ExecutionResult.ExitClassification, ExitCode: job.ExecutionResult.ExitCode, Version: job.ExecutionResult.Version, Checksum: job.ExecutionResult.Checksum, SizeBytes: job.ExecutionResult.SizeBytes, Summary: job.ExecutionResult.Summary, ServerDeploymentEvidence: serverDeploymentEvidenceFromDomain(job.ExecutionResult.ServerDeploymentEvidence)},
+		ExecutionResult:  executionResult,
 		RetryPolicy: JobRetryPolicyResponse{
 			MaxAttempts:           job.RetryPolicy.MaxAttempts,
 			InitialBackoffSeconds: job.RetryPolicy.InitialBackoffSeconds,
@@ -2023,6 +2035,14 @@ func JobFromDomain(job domain.Job) JobResponse {
 	}
 }
 
+func jobExecutionResultFromDomain(result domain.JobExecutionResult) *JobExecutionResultResponse {
+	response := JobExecutionResultResponse{Kind: result.Kind, ProcessState: result.ProcessState, ExitClassification: result.ExitClassification, ExitCode: result.ExitCode, Version: result.Version, Checksum: result.Checksum, SizeBytes: result.SizeBytes, Summary: result.Summary, ServerDeploymentEvidence: serverDeploymentEvidenceFromDomain(result.ServerDeploymentEvidence)}
+	if response.Kind == "" && response.ProcessState == "" && response.ExitClassification == "" && response.ExitCode == 0 && response.Version == 0 && response.Checksum == "" && response.SizeBytes == 0 && response.Summary == "" && response.ServerDeploymentEvidence == nil {
+		return nil
+	}
+	return &response
+}
+
 func optionalTime(value time.Time) *time.Time {
 	if value.IsZero() {
 		return nil
@@ -2034,7 +2054,7 @@ func optionalTime(value time.Time) *time.Time {
 func JobListFromDomain(jobs []domain.Job) JobListResponse {
 	items := make([]JobResponse, len(jobs))
 	for i, job := range jobs {
-		items[i] = JobFromDomain(job)
+		items[i] = JobListItemFromDomain(job)
 	}
 	return JobListResponse{Items: items, Count: len(items)}
 }

platform/protocol/run-contracts.md

@@ -89,7 +89,7 @@ Run-assigned Platform jobs use `job.<jobId>.<streamKey>` log stream IDs. Autonom
 
 Log ingest is durable and independently retried. Artifact/file transfer backlog must not prevent log batch acknowledgement, duplicate acknowledgement, cursor state updates, or spool cleanup.
 
-The platform stores log stream metadata through `repo.Store` and stores log bodies through the configured `LogBodyStore`. The default `file` backend persists platform metadata to `PLATFORM_METADATA_PATH` and appends log entries to segmented JSONL files under `PLATFORM_LOG_DIR`; the `memory` backend is only for tests and disposable local development. MySQL/Postgres are appropriate for platform metadata, stream state, retention policy, indexes, and operational records, but should not be the primary row-per-log-line store for hundreds or thousands of servers. Production log bodies should move behind the same boundary to append/query backends such as ClickHouse, Loki, OpenSearch/Elasticsearch, or object-storage segments with compact indexes.
+The platform stores log stream metadata through `repo.Store` and stores log bodies through the configured `LogBodyStore`. The default `file` backend persists platform metadata to `PLATFORM_METADATA_PATH`, keeps high-frequency Run endpoint/session runtime state in a lightweight sibling runtime snapshot, and appends log entries to segmented JSONL files under `PLATFORM_LOG_DIR`; the `memory` backend is only for tests and disposable local development. MySQL/Postgres are appropriate for platform metadata, stream state, retention policy, indexes, and operational records, but should not be the primary row-per-log-line store for hundreds or thousands of servers. Production log bodies should move behind the same boundary to append/query backends such as ClickHouse, Loki, OpenSearch/Elasticsearch, or object-storage segments with compact indexes.
 
 ## Artifact
 

platform/repo/file_store.go

@@ -38,10 +38,17 @@ type StoreSnapshot struct {
 	PluginDataRecords         []domain.PluginDataRecord               `json:"pluginDataRecords"`
 }
 
+type runtimeSnapshot struct {
+	RunControlSessions []domain.RunControlSession `json:"runControlSessions"`
+	RunEndpoints       []domain.RunEndpoint       `json:"runEndpoints"`
+}
+
 type FileStore struct {
 	*MemoryStore
-	path      string
-	persistMu sync.Mutex
+	path             string
+	runtimePath      string
+	persistMu        sync.Mutex
+	runtimePersistMu sync.Mutex
 }
 
 func NewFileStore(path string) (*FileStore, error) {
@@ -52,6 +59,7 @@ func NewFileStore(path string) (*FileStore, error) {
 	store := &FileStore{
 		MemoryStore: NewMemoryStore(),
 		path:        path,
+		runtimePath: runtimeMetadataPath(path),
 	}
 	if err := store.load(); err != nil {
 		return nil, err
@@ -72,7 +80,7 @@ func (store *FileStore) AuthSessions() AuthSessionRepository {
 }
 
 func (store *FileStore) RunControlSessions() RunControlSessionRepository {
-	return &persistentRepository[domain.RunControlSession, struct{}]{repository: store.MemoryStore.runSessions, persist: store.persist}
+	return &persistentRepository[domain.RunControlSession, struct{}]{repository: store.MemoryStore.runSessions, persist: store.persistRuntime}
 }
 
 func (store *FileStore) AIProviders() AIProviderRepository {
@@ -88,7 +96,7 @@ func (store *FileStore) ServerInstances() ServerInstanceRepository {
 }
 
 func (store *FileStore) RunEndpoints() RunEndpointRepository {
-	return &persistentRepository[domain.RunEndpoint, domain.RunEndpointFilter]{repository: store.MemoryStore.runEndpoints, persist: store.persist}
+	return &persistentRepository[domain.RunEndpoint, domain.RunEndpointFilter]{repository: store.MemoryStore.runEndpoints, persist: store.persistRuntime}
 }
 
 func (store *FileStore) Jobs() JobRepository {
@@ -163,19 +171,18 @@ func (store *FileStore) load() error {
 	data, err := os.ReadFile(store.path)
 	if err != nil {
 		if os.IsNotExist(err) {
-			return nil
+			return store.loadRuntime()
 		}
 		return fmt.Errorf("read metadata snapshot: %w", err)
 	}
-	if len(strings.TrimSpace(string(data))) == 0 {
-		return nil
+	if len(strings.TrimSpace(string(data))) != 0 {
+		var snapshot StoreSnapshot
+		if err := json.Unmarshal(data, &snapshot); err != nil {
+			return fmt.Errorf("decode metadata snapshot: %w", err)
+		}
+		store.loadSnapshot(snapshot)
 	}
-	var snapshot StoreSnapshot
-	if err := json.Unmarshal(data, &snapshot); err != nil {
-		return fmt.Errorf("decode metadata snapshot: %w", err)
-	}
-	store.loadSnapshot(snapshot)
-	return nil
+	return store.loadRuntime()
 }
 
 func (store *FileStore) persist() error {
@@ -183,7 +190,7 @@ func (store *FileStore) persist() error {
 	defer store.persistMu.Unlock()
 
 	snapshot := store.snapshot()
-	data, err := json.MarshalIndent(snapshot, "", "  ")
+	data, err := json.Marshal(snapshot)
 	if err != nil {
 		return fmt.Errorf("encode metadata snapshot: %w", err)
 	}
@@ -200,6 +207,85 @@ func (store *FileStore) persist() error {
 	return nil
 }
 
+func (store *FileStore) loadRuntime() error {
+	data, err := os.ReadFile(store.runtimePath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
+		return fmt.Errorf("read runtime metadata snapshot: %w", err)
+	}
+	if len(strings.TrimSpace(string(data))) == 0 {
+		return nil
+	}
+	var snapshot runtimeSnapshot
+	if err := json.Unmarshal(data, &snapshot); err != nil {
+		return fmt.Errorf("decode runtime metadata snapshot: %w", err)
+	}
+	store.loadRuntimeSnapshot(snapshot)
+	return nil
+}
+
+func (store *FileStore) persistRuntime() error {
+	store.runtimePersistMu.Lock()
+	defer store.runtimePersistMu.Unlock()
+
+	snapshot := store.runtimeSnapshot()
+	data, err := json.Marshal(snapshot)
+	if err != nil {
+		return fmt.Errorf("encode runtime metadata snapshot: %w", err)
+	}
+	if err := os.MkdirAll(filepath.Dir(store.runtimePath), 0o755); err != nil {
+		return fmt.Errorf("create runtime metadata directory: %w", err)
+	}
+	if err := store.ensureMetadataFile(); err != nil {
+		return err
+	}
+	tmpPath := store.runtimePath + ".tmp"
+	if err := os.WriteFile(tmpPath, data, 0o600); err != nil {
+		return fmt.Errorf("write runtime metadata snapshot: %w", err)
+	}
+	if err := os.Rename(tmpPath, store.runtimePath); err != nil {
+		return fmt.Errorf("replace runtime metadata snapshot: %w", err)
+	}
+	return nil
+}
+
+func (store *FileStore) ensureMetadataFile() error {
+	if _, err := os.Stat(store.path); err == nil {
+		return nil
+	} else if !os.IsNotExist(err) {
+		return fmt.Errorf("stat metadata snapshot: %w", err)
+	}
+
+	store.persistMu.Lock()
+	defer store.persistMu.Unlock()
+	if _, err := os.Stat(store.path); err == nil {
+		return nil
+	} else if !os.IsNotExist(err) {
+		return fmt.Errorf("stat metadata snapshot: %w", err)
+	}
+	if err := os.MkdirAll(filepath.Dir(store.path), 0o755); err != nil {
+		return fmt.Errorf("create metadata directory: %w", err)
+	}
+	tmpPath := store.path + ".empty.tmp"
+	if err := os.WriteFile(tmpPath, []byte("{}"), 0o600); err != nil {
+		return fmt.Errorf("write empty metadata snapshot: %w", err)
+	}
+	if err := os.Rename(tmpPath, store.path); err != nil {
+		return fmt.Errorf("replace empty metadata snapshot: %w", err)
+	}
+	return nil
+}
+
+func runtimeMetadataPath(path string) string {
+	ext := filepath.Ext(path)
+	if ext == "" {
+		return path + ".runtime"
+	}
+	return strings.TrimSuffix(path, ext) + ".runtime" + ext
+}
+
 func (store *FileStore) snapshot() StoreSnapshot {
 	return StoreSnapshot{
 		Users:                     snapshotRepository(store.MemoryStore.users),
@@ -228,6 +314,13 @@ func (store *FileStore) snapshot() StoreSnapshot {
 	}
 }
 
+func (store *FileStore) runtimeSnapshot() runtimeSnapshot {
+	return runtimeSnapshot{
+		RunControlSessions: snapshotRepository(store.MemoryStore.runSessions),
+		RunEndpoints:       snapshotRepository(store.MemoryStore.runEndpoints),
+	}
+}
+
 func (store *FileStore) loadSnapshot(snapshot StoreSnapshot) {
 	loadRepository(store.MemoryStore.users, snapshot.Users)
 	loadRepository(store.MemoryStore.authSessions, snapshot.AuthSessions)
@@ -254,6 +347,11 @@ func (store *FileStore) loadSnapshot(snapshot StoreSnapshot) {
 	loadRepository(store.MemoryStore.pluginDataRecords, snapshot.PluginDataRecords)
 }
 
+func (store *FileStore) loadRuntimeSnapshot(snapshot runtimeSnapshot) {
+	loadRepository(store.MemoryStore.runSessions, snapshot.RunControlSessions)
+	loadRepository(store.MemoryStore.runEndpoints, snapshot.RunEndpoints)
+}
+
 type mutableRepository[T any, F any] interface {
 	Create(T) error
 	Get(string) (T, error)

platform/repo/mysql_store.go

@@ -14,12 +14,16 @@ import (
 	_ "github.com/go-sql-driver/mysql"
 )
 
-const mysqlSnapshotID = "current"
+const (
+	mysqlSnapshotID        = "current"
+	mysqlRuntimeSnapshotID = "runtime"
+)
 
 type MySQLStore struct {
 	*MemoryStore
-	db        *sql.DB
-	persistMu sync.Mutex
+	db               *sql.DB
+	persistMu        sync.Mutex
+	runtimePersistMu sync.Mutex
 }
 
 func NewMySQLStore(dsn string) (*MySQLStore, error) {
@@ -59,7 +63,7 @@ func (store *MySQLStore) AuthSessions() AuthSessionRepository {
 }
 
 func (store *MySQLStore) RunControlSessions() RunControlSessionRepository {
-	return &persistentRepository[domain.RunControlSession, struct{}]{repository: store.MemoryStore.runSessions, persist: store.persist}
+	return &persistentRepository[domain.RunControlSession, struct{}]{repository: store.MemoryStore.runSessions, persist: store.persistRuntime}
 }
 
 func (store *MySQLStore) AIProviders() AIProviderRepository {
@@ -75,7 +79,7 @@ func (store *MySQLStore) ServerInstances() ServerInstanceRepository {
 }
 
 func (store *MySQLStore) RunEndpoints() RunEndpointRepository {
-	return &persistentRepository[domain.RunEndpoint, domain.RunEndpointFilter]{repository: store.MemoryStore.runEndpoints, persist: store.persist}
+	return &persistentRepository[domain.RunEndpoint, domain.RunEndpointFilter]{repository: store.MemoryStore.runEndpoints, persist: store.persistRuntime}
 }
 
 func (store *MySQLStore) Jobs() JobRepository {
@@ -171,7 +175,7 @@ func (store *MySQLStore) load() error {
 	err := store.db.QueryRowContext(ctx, "SELECT snapshot_json FROM platform_metadata_snapshots WHERE id = ?", mysqlSnapshotID).Scan(&payload)
 	if err != nil {
 		if err == sql.ErrNoRows {
-			return nil
+			return store.loadRuntime()
 		}
 		return fmt.Errorf("read mysql metadata snapshot: %w", err)
 	}
@@ -180,6 +184,25 @@ func (store *MySQLStore) load() error {
 		return fmt.Errorf("decode mysql metadata snapshot: %w", err)
 	}
 	store.loadSnapshot(snapshot)
+	return store.loadRuntime()
+}
+
+func (store *MySQLStore) loadRuntime() error {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	var payload []byte
+	err := store.db.QueryRowContext(ctx, "SELECT snapshot_json FROM platform_metadata_snapshots WHERE id = ?", mysqlRuntimeSnapshotID).Scan(&payload)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return nil
+		}
+		return fmt.Errorf("read mysql runtime metadata snapshot: %w", err)
+	}
+	var snapshot runtimeSnapshot
+	if err := json.Unmarshal(payload, &snapshot); err != nil {
+		return fmt.Errorf("decode mysql runtime metadata snapshot: %w", err)
+	}
+	store.loadRuntimeSnapshot(snapshot)
 	return nil
 }
 
@@ -204,6 +227,27 @@ ON DUPLICATE KEY UPDATE snapshot_json = ?, updated_at = CURRENT_TIMESTAMP`, mysq
 	return nil
 }
 
+func (store *MySQLStore) persistRuntime() error {
+	store.runtimePersistMu.Lock()
+	defer store.runtimePersistMu.Unlock()
+
+	snapshot := store.runtimeSnapshot()
+	payload, err := json.Marshal(snapshot)
+	if err != nil {
+		return fmt.Errorf("encode mysql runtime metadata snapshot: %w", err)
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	_, err = store.db.ExecContext(ctx, `
+INSERT INTO platform_metadata_snapshots (id, snapshot_json)
+VALUES (?, ?)
+ON DUPLICATE KEY UPDATE snapshot_json = ?, updated_at = CURRENT_TIMESTAMP`, mysqlRuntimeSnapshotID, string(payload), string(payload))
+	if err != nil {
+		return fmt.Errorf("write mysql runtime metadata snapshot: %w", err)
+	}
+	return nil
+}
+
 func (store *MySQLStore) snapshot() StoreSnapshot {
 	return StoreSnapshot{
 		Users:                     snapshotRepository(store.MemoryStore.users),
@@ -232,6 +276,13 @@ func (store *MySQLStore) snapshot() StoreSnapshot {
 	}
 }
 
+func (store *MySQLStore) runtimeSnapshot() runtimeSnapshot {
+	return runtimeSnapshot{
+		RunControlSessions: snapshotRepository(store.MemoryStore.runSessions),
+		RunEndpoints:       snapshotRepository(store.MemoryStore.runEndpoints),
+	}
+}
+
 func (store *MySQLStore) loadSnapshot(snapshot StoreSnapshot) {
 	loadRepository(store.MemoryStore.users, snapshot.Users)
 	loadRepository(store.MemoryStore.authSessions, snapshot.AuthSessions)
@@ -257,3 +308,8 @@ func (store *MySQLStore) loadSnapshot(snapshot StoreSnapshot) {
 	loadRepository(store.MemoryStore.bridgeStreams, snapshot.GameClientBridgeStreams)
 	loadRepository(store.MemoryStore.pluginDataRecords, snapshot.PluginDataRecords)
 }
+
+func (store *MySQLStore) loadRuntimeSnapshot(snapshot runtimeSnapshot) {
+	loadRepository(store.MemoryStore.runSessions, snapshot.RunControlSessions)
+	loadRepository(store.MemoryStore.runEndpoints, snapshot.RunEndpoints)
+}

platform/repo/resources.go

@@ -486,6 +486,39 @@ func newMemoryJobRepository() *memoryJobRepository {
 	}
 }
 
+func (repository *memoryJobRepository) List(filter domain.JobFilter) ([]domain.Job, error) {
+	if filter.Limit <= 0 {
+		return repository.memoryRepository.List(filter)
+	}
+
+	repository.mu.RLock()
+	defer repository.mu.RUnlock()
+
+	values := make([]domain.Job, 0, min(filter.Limit, len(repository.byID)))
+	for _, job := range repository.byID {
+		if repository.match(job, filter) {
+			values = append(values, domain.CopyJob(job))
+		}
+	}
+	sort.SliceStable(values, func(i, j int) bool {
+		leftUpdated := values[i].UpdatedAt
+		rightUpdated := values[j].UpdatedAt
+		if !leftUpdated.Equal(rightUpdated) {
+			return leftUpdated.After(rightUpdated)
+		}
+		leftCreated := values[i].CreatedAt
+		rightCreated := values[j].CreatedAt
+		if !leftCreated.Equal(rightCreated) {
+			return leftCreated.After(rightCreated)
+		}
+		return values[i].ID < values[j].ID
+	})
+	if len(values) > filter.Limit {
+		values = values[:filter.Limit]
+	}
+	return values, nil
+}
+
 func (repository *memoryJobRepository) GetByIdempotency(runEndpointID string, idempotencyKey string) (domain.Job, error) {
 	repository.mu.RLock()
 	defer repository.mu.RUnlock()

platform/repo/resources_test.go

@@ -1,6 +1,7 @@
 package repo
 
 import (
+	"bytes"
 	"encoding/json"
 	"errors"
 	"os"
@@ -306,6 +307,56 @@ func TestMySQLSnapshotRoundTripsDurableJobSchedulingMetadata(t *testing.T) {
 	}
 }
 
+func TestFileStorePersistsRunRuntimeStateSeparately(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "metadata.json")
+	store, err := NewFileStore(path)
+	if err != nil {
+		t.Fatalf("create file store: %v", err)
+	}
+	stamp := time.Date(2026, 7, 18, 10, 0, 0, 0, time.UTC)
+	if err := store.PluginDataRecords().Create(domain.PluginDataRecord{ID: "plugin-record-1", PluginID: "server.scum", ServerInstanceID: "server-1", Collection: "players", Key: "steam-1", Value: map[string]any{"displayName": "Ada"}, CreatedAt: stamp, UpdatedAt: stamp}); err != nil {
+		t.Fatalf("create plugin data: %v", err)
+	}
+	mainBefore, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("read main snapshot before runtime update: %v", err)
+	}
+
+	endpoint := domain.RunEndpoint{ID: "run-runtime", DisplayName: "Runtime Run", Version: "1.0.0", Platform: "linux", Architecture: "amd64", Status: domain.RunEndpointStatusOnline, Capacity: domain.RunCapacity{MaxJobs: 4}, LastHeartbeatAt: stamp}
+	if err := store.RunEndpoints().Create(endpoint); err != nil {
+		t.Fatalf("create runtime endpoint: %v", err)
+	}
+	session := domain.RunControlSession{RunEndpointID: endpoint.ID, SessionToken: "raw-runtime-token", SessionTokenHash: strings.Repeat("a", 64), Status: domain.AuthSessionStatusActive, Generation: 1, CapabilityFingerprint: "cap-runtime", HeartbeatIntervalSeconds: 15, CreatedAt: stamp, UpdatedAt: stamp, ExpiresAt: stamp.Add(time.Hour), RequireSignedRequests: true, UsedNonces: []string{"nonce-1"}}
+	if err := store.RunControlSessions().Create(session); err != nil {
+		t.Fatalf("create runtime session: %v", err)
+	}
+	mainAfter, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("read main snapshot after runtime update: %v", err)
+	}
+	if !bytes.Equal(mainBefore, mainAfter) {
+		t.Fatalf("runtime updates rewrote the main metadata snapshot")
+	}
+	runtimePayload, err := os.ReadFile(runtimeMetadataPath(path))
+	if err != nil {
+		t.Fatalf("read runtime snapshot: %v", err)
+	}
+	if !strings.Contains(string(runtimePayload), endpoint.ID) || strings.Contains(string(runtimePayload), session.SessionToken) {
+		t.Fatalf("unexpected runtime snapshot payload: %s", runtimePayload)
+	}
+
+	reloaded, err := NewFileStore(path)
+	if err != nil {
+		t.Fatalf("reload file store: %v", err)
+	}
+	if got, err := reloaded.RunEndpoints().Get(endpoint.ID); err != nil || got.Version != endpoint.Version {
+		t.Fatalf("runtime endpoint did not reload: %+v err=%v", got, err)
+	}
+	if got, err := reloaded.RunControlSessions().Get(endpoint.ID); err != nil || got.SessionTokenHash != session.SessionTokenHash || got.UsedNonces[0] != "nonce-1" {
+		t.Fatalf("runtime session did not reload: %+v err=%v", got, err)
+	}
+}
+
 func TestFileStorePersistsPluginOperationsStateAcrossRestart(t *testing.T) {
 	path := filepath.Join(t.TempDir(), "plugin-operations.json")
 	store, err := NewFileStore(path)

platform_web/api/client.test.ts

@@ -323,6 +323,9 @@ describe("PlatformApiClient AI providers", () => {
       if (url.endsWith("/api/v1/jobs?states=queued%2Crunning%2Cfailed")) {
         return jsonResponse({ items: [job], count: 1 });
       }
+      if (url.endsWith("/api/v1/jobs?states=queued%2Crunning%2Cfailed&limit=25")) {
+        return jsonResponse({ items: [job], count: 1 });
+      }
       if (url.endsWith("/api/v1/jobs?serverInstanceId=server-1&states=queued%2Crunning%2Cfailed")) {
         return jsonResponse({ items: [job], count: 1 });
       }
@@ -584,6 +587,7 @@ describe("PlatformApiClient AI providers", () => {
     await expect(client.listJobs()).resolves.toMatchObject({ count: 1 });
     await expect(client.listJobs(server.id)).resolves.toMatchObject({ count: 1 });
     await expect(client.listJobs(undefined, { states: ["queued", "running", "failed"] })).resolves.toMatchObject({ count: 1 });
+    await expect(client.listJobs(undefined, { states: ["queued", "running", "failed"], limit: 25 })).resolves.toMatchObject({ count: 1 });
     await expect(client.listJobs(server.id, { states: ["queued", "running", "failed"] })).resolves.toMatchObject({ count: 1 });
     await expect(client.listArtifacts({ ownerKind: "job", ownerId: job.id, state: "available" })).resolves.toMatchObject({ count: 1, items: [{ id: artifact.id }] });
     await expect(client.openArtifactDownload(artifact.id)).resolves.toMatchObject({ downloadUrl: "/api/v1/artifacts/artifact-1/content", rangeSupported: true });
@@ -625,7 +629,7 @@ describe("PlatformApiClient AI providers", () => {
       client.invokeAI({ requestId: "ai-1", serverInstanceId: server.id, purpose: "config.suggest", prompt: "Tune PVP safely", currentConfig: "server.name=Example Survival #1\n" })
     ).resolves.toMatchObject({ status: "ok", usage: { mocked: true }, configRecommendation: { diffSummary: "review required" } });
 
-    expect(fetchMock).toHaveBeenCalledTimes(46);
+    expect(fetchMock).toHaveBeenCalledTimes(47);
   });
 
   it("normalizes server file workspace null arrays from older platform responses", async () => {

platform_web/api/client.ts

@@ -152,6 +152,7 @@ interface JobListFilter {
   runEndpointId?: string;
   state?: JobState;
   states?: JobState[];
+  limit?: number;
 }
 
 export class PlatformApiClient {
@@ -925,6 +926,7 @@ function jobListQuery(serverInstanceId: string | undefined, filter: JobListFilte
   if (filter.runEndpointId) params.set("runEndpointId", filter.runEndpointId);
   if (filter.state) params.set("state", filter.state);
   if (filter.states?.length) params.set("states", filter.states.join(","));
+  if (filter.limit !== undefined) params.set("limit", String(filter.limit));
   const query = params.toString();
   return query ? `?${query}` : "";
 }

platform_web/pages/HomePage.tsx

@@ -33,6 +33,9 @@ interface OverviewData {
   jobs: JobResponse[];
 }
 
+const overviewJobStates: JobResponse["state"][] = ["failed"];
+const overviewJobLimit = 50;
+
 export interface HomePageInitialState {
   core?: OperationsModuleState<OverviewData>;
   metrics?: OperationsModuleState<ServerMetricsResponse[]>;
@@ -55,7 +58,7 @@ export function HomePage({ session, onNavigate, initialState }: HomePageProps) {
     try {
       const [instances, jobs] = await Promise.all([
         platformApiClient.listServerInstances(),
-        platformApiClient.listJobs()
+        platformApiClient.listJobs(undefined, { states: overviewJobStates, limit: overviewJobLimit })
       ]);
       setCore({ status: "ready", data: { instances: instances.items, jobs: jobs.items }, refreshedAt: refreshedNow() });
     } catch (error) {

platform_web/pages/MaintenancePage.tsx

@@ -10,6 +10,9 @@ import { cx } from "../utils/classes";
 
 type ModuleState<T> = { status: "loading" } | { status: "error"; reason: string } | { status: "ready"; data: T };
 
+const maintenanceJobStates: JobResponse["state"][] = ["failed"];
+const maintenanceJobLimit = 100;
+
 export function MaintenancePage({ session, operations, onNavigate }: PageComponentProps) {
   const [jobs, setJobs] = useState<ModuleState<JobResponse[]>>({ status: "loading" });
   const [servers, setServers] = useState<ModuleState<ServerInstanceResponse[]>>({ status: "loading" });
@@ -18,7 +21,7 @@ export function MaintenancePage({ session, operations, onNavigate }: PageCompone
   const refreshJobs = useCallback(async () => {
     setJobs({ status: "loading" });
     try {
-      const response = await platformApiClient.listJobs();
+      const response = await platformApiClient.listJobs(undefined, { states: maintenanceJobStates, limit: maintenanceJobLimit });
       setJobs({ status: "ready", data: response.items });
     } catch (error) {
       setJobs({ status: "error", reason: error instanceof Error ? error.message : "加载失败" });

platform_web/pages/ServersPage.tsx

@@ -66,6 +66,7 @@ const serverListRefreshMs = 15000;
 const serverMetricFreshMs = 30000;
 const serverForceDeleteConfirmation = "FORCE DELETE";
 const serverOperationalJobStates: JobResponse["state"][] = ["queued", "accepted", "running", "retrying", "failed"];
+const serverOperationalJobLimit = 200;
 
 export function ServersPage({ session, operations, onNavigate }: PageComponentProps) {
   const [listState, setListState] = useState<ListState>("loading");
@@ -97,7 +98,7 @@ export function ServersPage({ session, operations, onNavigate }: PageComponentPr
         showLoading ? platformApiClient.listGamePlugins() : Promise.resolve(undefined),
         platformApiClient.listRunEndpoints({ status: "online" }),
         platformApiClient.listServerInstances(),
-        platformApiClient.listJobs(undefined, { states: serverOperationalJobStates })
+        platformApiClient.listJobs(undefined, { states: serverOperationalJobStates, limit: serverOperationalJobLimit })
       ]);
       if (pluginResponse) setPlugins(pluginResponse.items);
       setEndpoints(endpointResponse.items);