Fix busy binary reinstall and add per-node log viewing.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/db/db.go

@@ -75,6 +75,7 @@ CREATE TABLE IF NOT EXISTS nodes (
     install_mode TEXT NOT NULL DEFAULT 'auto',
     last_error TEXT NOT NULL DEFAULT '',
     install_log TEXT NOT NULL DEFAULT '',
+    runtime_log TEXT NOT NULL DEFAULT '',
     agent_version TEXT NOT NULL DEFAULT '',
     last_seen_at TIMESTAMPTZ,
     created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
@@ -95,8 +96,12 @@ CREATE TABLE IF NOT EXISTS node_protocols (
 
 CREATE INDEX IF NOT EXISTS idx_node_protocols_protocol ON node_protocols(protocol_id);
 `
-	_, err := db.Exec(schema)
-	return err
+	if _, err := db.Exec(schema); err != nil {
+		return err
+	}
+	// Additive migrations for existing deployments.
+	_, _ = db.Exec(`ALTER TABLE nodes ADD COLUMN IF NOT EXISTS runtime_log TEXT NOT NULL DEFAULT ''`)
+	return nil
 }
 
 func SeedAdmin(db *sql.DB, cfg *config.Config) error {

internal/db/nodes.go

@@ -20,7 +20,7 @@ func scanNode(scanner interface {
 	err := scanner.Scan(
 		&n.ID, &n.Name, &n.Host, &n.SSHPort, &n.SSHUser, &n.SSHAuthType, &n.SSHSecretEnc,
 		&n.NodePort, &n.SecretKey, &status, &n.InstallMode, &n.LastError, &n.InstallLog,
-		&n.AgentVersion, &lastSeen, &n.CreatedAt, &n.UpdatedAt,
+		&n.RuntimeLog, &n.AgentVersion, &lastSeen, &n.CreatedAt, &n.UpdatedAt,
 	)
 	if err != nil {
 		return nil, err
@@ -36,7 +36,7 @@ func scanNode(scanner interface {
 const nodeColumns = `
 id, name, host, ssh_port, ssh_user, ssh_auth_type, ssh_secret_enc,
 node_port, secret_key, status, install_mode, last_error, install_log,
-agent_version, last_seen_at, created_at, updated_at`
+runtime_log, agent_version, last_seen_at, created_at, updated_at`
 
 func CreateNode(db *sql.DB, n *models.Node) error {
 	if n.ID == uuid.Nil {
@@ -52,13 +52,13 @@ func CreateNode(db *sql.DB, n *models.Node) error {
 INSERT INTO nodes (
   id, name, host, ssh_port, ssh_user, ssh_auth_type, ssh_secret_enc,
   node_port, secret_key, status, install_mode, last_error, install_log,
-  agent_version, last_seen_at, created_at, updated_at
+  runtime_log, agent_version, last_seen_at, created_at, updated_at
 ) VALUES (
-  $1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,$16,$17
+  $1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,$16,$17,$18
 )`,
 		n.ID, n.Name, n.Host, n.SSHPort, n.SSHUser, n.SSHAuthType, n.SSHSecretEnc,
 		n.NodePort, n.SecretKey, string(n.Status), n.InstallMode, n.LastError, n.InstallLog,
-		n.AgentVersion, n.LastSeenAt, n.CreatedAt, n.UpdatedAt,
+		n.RuntimeLog, n.AgentVersion, n.LastSeenAt, n.CreatedAt, n.UpdatedAt,
 	)
 	return err
 }
@@ -114,6 +114,17 @@ WHERE id = $1`, id, strings.TrimRight(chunk, "\n"))
 	return err
 }
 
+func SetNodeRuntimeLog(db *sql.DB, id uuid.UUID, logText string) error {
+	// Cap stored log size to keep DB rows reasonable.
+	const max = 200_000
+	if len(logText) > max {
+		logText = logText[len(logText)-max:]
+	}
+	_, err := db.Exec(`
+UPDATE nodes SET runtime_log = $2, updated_at = NOW() WHERE id = $1`, id, logText)
+	return err
+}
+
 func MarkNodeSeen(db *sql.DB, id uuid.UUID, version string, status models.NodeStatus) error {
 	_, err := db.Exec(`
 UPDATE nodes