fix: repair version detection platform query format

- Fix GetLatestVersionByTypeAndArch to separate platform/architecture
- Query now correctly uses platform='linux' and architecture='amd64'
- Resolves UI showing 'no packages available' despite updates existing

aggregator-server/internal/database/queries/agent_updates.go

@@ -216,4 +216,66 @@ func (q *AgentUpdateQueries) GetAgentByMachineID(machineID string) (*models.Agen
 	}
 
 	return &agent, nil
+}
+
+// GetLatestVersion retrieves the latest available version for a platform
+func (q *AgentUpdateQueries) GetLatestVersion(platform string) (string, error) {
+	query := `
+		SELECT version FROM agent_update_packages
+		WHERE platform = $1 AND is_active = true
+		ORDER BY version DESC LIMIT 1
+	`
+
+	var latestVersion string
+	err := q.db.Get(&latestVersion, query, platform)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return "", fmt.Errorf("no update packages available for platform %s", platform)
+		}
+		return "", fmt.Errorf("failed to get latest version: %w", err)
+	}
+
+	return latestVersion, nil
+}
+
+// GetLatestVersionByTypeAndArch retrieves the latest available version for a specific os_type and architecture
+func (q *AgentUpdateQueries) GetLatestVersionByTypeAndArch(osType, osArch string) (string, error) {
+	query := `
+		SELECT version FROM agent_update_packages
+		WHERE platform = $1 AND architecture = $2 AND is_active = true
+		ORDER BY version DESC LIMIT 1
+	`
+
+	var latestVersion string
+	err := q.db.Get(&latestVersion, query, osType, osArch)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return "", fmt.Errorf("no update packages available for platform %s/%s", osType, osArch)
+		}
+		return "", fmt.Errorf("failed to get latest version: %w", err)
+	}
+
+	return latestVersion, nil
+}
+
+// GetPendingUpdateCommand retrieves the most recent pending update command for an agent
+func (q *AgentUpdateQueries) GetPendingUpdateCommand(agentID string) (*models.AgentCommand, error) {
+	query := `
+		SELECT id, agent_id, command_type, params, status, source, created_at, sent_at, completed_at, result, retried_from_id
+		FROM agent_commands
+		WHERE agent_id = $1 AND command_type = 'install_update' AND status = 'pending'
+		ORDER BY created_at DESC
+		LIMIT 1
+	`
+
+	var command models.AgentCommand
+	err := q.db.Get(&command, query, agentID)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil // No pending update command found
+		}
+		return nil, fmt.Errorf("failed to get pending update command: %w", err)
+	}
+
+	return &command, nil
 }