Session 4 complete - RedFlag update management platform

🚩 Private development - version retention only

✅ Complete web dashboard (React + TypeScript + TailwindCSS)
✅ Production-ready server backend (Go + Gin + PostgreSQL)
✅ Linux agent with APT + Docker scanning + local CLI tools
✅ JWT authentication and REST API
✅ Update discovery and approval workflow

🚧 Status: Alpha software - active development
📦 Purpose: Version retention during development
⚠️  Not for public use or deployment

aggregator-server/internal/models/agent.go

@@ -0,0 +1,105 @@
+package models
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+// Agent represents a registered update agent
+type Agent struct {
+	ID             uuid.UUID `json:"id" db:"id"`
+	Hostname       string    `json:"hostname" db:"hostname"`
+	OSType         string    `json:"os_type" db:"os_type"`
+	OSVersion      string    `json:"os_version" db:"os_version"`
+	OSArchitecture string    `json:"os_architecture" db:"os_architecture"`
+	AgentVersion   string    `json:"agent_version" db:"agent_version"`
+	LastSeen       time.Time `json:"last_seen" db:"last_seen"`
+	Status         string    `json:"status" db:"status"`
+	Metadata       JSONB     `json:"metadata" db:"metadata"`
+	CreatedAt      time.Time `json:"created_at" db:"created_at"`
+	UpdatedAt      time.Time `json:"updated_at" db:"updated_at"`
+}
+
+// AgentSpecs represents system specifications for an agent
+type AgentSpecs struct {
+	ID                uuid.UUID       `json:"id" db:"id"`
+	AgentID           uuid.UUID       `json:"agent_id" db:"agent_id"`
+	CPUModel          string          `json:"cpu_model" db:"cpu_model"`
+	CPUCores          int             `json:"cpu_cores" db:"cpu_cores"`
+	MemoryTotalMB     int             `json:"memory_total_mb" db:"memory_total_mb"`
+	DiskTotalGB       int             `json:"disk_total_gb" db:"disk_total_gb"`
+	DiskFreeGB        int             `json:"disk_free_gb" db:"disk_free_gb"`
+	NetworkInterfaces JSONB           `json:"network_interfaces" db:"network_interfaces"`
+	DockerInstalled   bool            `json:"docker_installed" db:"docker_installed"`
+	DockerVersion     string          `json:"docker_version" db:"docker_version"`
+	PackageManagers   StringArray     `json:"package_managers" db:"package_managers"`
+	CollectedAt       time.Time       `json:"collected_at" db:"collected_at"`
+}
+
+// AgentRegistrationRequest is the payload for agent registration
+type AgentRegistrationRequest struct {
+	Hostname       string            `json:"hostname" binding:"required"`
+	OSType         string            `json:"os_type" binding:"required"`
+	OSVersion      string            `json:"os_version"`
+	OSArchitecture string            `json:"os_architecture"`
+	AgentVersion   string            `json:"agent_version" binding:"required"`
+	Metadata       map[string]string `json:"metadata"`
+}
+
+// AgentRegistrationResponse is returned after successful registration
+type AgentRegistrationResponse struct {
+	AgentID uuid.UUID              `json:"agent_id"`
+	Token   string                 `json:"token"`
+	Config  map[string]interface{} `json:"config"`
+}
+
+// JSONB type for PostgreSQL JSONB columns
+type JSONB map[string]interface{}
+
+// Value implements driver.Valuer for database storage
+func (j JSONB) Value() (driver.Value, error) {
+	if j == nil {
+		return nil, nil
+	}
+	return json.Marshal(j)
+}
+
+// Scan implements sql.Scanner for database retrieval
+func (j *JSONB) Scan(value interface{}) error {
+	if value == nil {
+		*j = nil
+		return nil
+	}
+	bytes, ok := value.([]byte)
+	if !ok {
+		return nil
+	}
+	return json.Unmarshal(bytes, j)
+}
+
+// StringArray type for PostgreSQL text[] columns
+type StringArray []string
+
+// Value implements driver.Valuer
+func (s StringArray) Value() (driver.Value, error) {
+	if s == nil {
+		return nil, nil
+	}
+	return json.Marshal(s)
+}
+
+// Scan implements sql.Scanner
+func (s *StringArray) Scan(value interface{}) error {
+	if value == nil {
+		*s = nil
+		return nil
+	}
+	bytes, ok := value.([]byte)
+	if !ok {
+		return nil
+	}
+	return json.Unmarshal(bytes, s)
+}