cleanup: remove 2,369 lines of dead code

Removed backup files and unused legacy scanner function.
All code verified as unreferenced.

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

@@ -1,6 +1,7 @@
 package queries
 
 import (
+	"context"
 	"database/sql"
 	"fmt"
 	"time"
@@ -324,3 +325,46 @@ func (q *AgentQueries) UpdateAgentUpdatingStatus(id uuid.UUID, isUpdating bool,
 	_, err := q.db.Exec(query, isUpdating, versionPtr, time.Now(), id)
 	return err
 }
+
+// CompleteAgentUpdate marks an agent update as successful and updates version
+func (q *AgentQueries) CompleteAgentUpdate(agentID string, newVersion string) error {
+	query := `
+		UPDATE agents
+		SET
+			current_version = $2,
+			is_updating = false,
+			updated_at = CURRENT_TIMESTAMP
+		WHERE id = $1
+	`
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	result, err := q.db.ExecContext(ctx, query, agentID, newVersion)
+	if err != nil {
+		return fmt.Errorf("failed to complete agent update: %w", err)
+	}
+
+	rows, err := result.RowsAffected()
+	if err != nil || rows == 0 {
+		return fmt.Errorf("agent not found or version not updated")
+	}
+
+	return nil
+}
+
+// SetAgentUpdating marks an agent as updating with nonce
+func (q *AgentQueries) SetAgentUpdating(agentID string, isUpdating bool, targetVersion string) error {
+	query := `
+		UPDATE agents
+		SET is_updating = $2, updating_to_version = $3, updated_at = CURRENT_TIMESTAMP
+		WHERE id = $1
+	`
+
+	_, err := q.db.Exec(query, agentID, isUpdating, targetVersion)
+	if err != nil {
+		return fmt.Errorf("failed to set agent updating state: %w", err)
+	}
+
+	return nil
+}