Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

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

backend/vtm/state/state.go

@@ -0,0 +1,99 @@
+package state
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+// StateManager manages conversation state
+type StateManager struct {
+	db *pgxpool.Pool
+}
+
+// NewStateManager creates a new state manager
+func NewStateManager(db *pgxpool.Pool) *StateManager {
+	return &StateManager{db: db}
+}
+
+// ConversationState represents conversation state
+type ConversationState struct {
+	SessionID    string
+	UserID       string
+	Workflow     string
+	Step         string
+	Context      map[string]interface{}
+	CreatedAt     time.Time
+	UpdatedAt     time.Time
+	ExpiresAt     time.Time
+}
+
+// SaveState saves conversation state
+func (s *StateManager) SaveState(ctx context.Context, state *ConversationState) error {
+	contextJSON, err := json.Marshal(state.Context)
+	if err != nil {
+		return fmt.Errorf("failed to marshal context: %w", err)
+	}
+
+	query := `
+		INSERT INTO conversation_states (
+			session_id, user_id, workflow, step, context, created_at, updated_at, expires_at
+		) VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+		ON CONFLICT (session_id) DO UPDATE SET
+			workflow = $3,
+			step = $4,
+			context = $5,
+			updated_at = $7,
+			expires_at = $8
+	`
+
+	_, err = s.db.Exec(ctx, query,
+		state.SessionID,
+		state.UserID,
+		state.Workflow,
+		state.Step,
+		contextJSON,
+		state.CreatedAt,
+		time.Now(),
+		state.ExpiresAt,
+	)
+
+	return err
+}
+
+// GetState gets conversation state
+func (s *StateManager) GetState(ctx context.Context, sessionID string) (*ConversationState, error) {
+	query := `
+		SELECT session_id, user_id, workflow, step, context, created_at, updated_at, expires_at
+		FROM conversation_states
+		WHERE session_id = $1
+	`
+
+	var state ConversationState
+	var contextJSON []byte
+
+	err := s.db.QueryRow(ctx, query, sessionID).Scan(
+		&state.SessionID,
+		&state.UserID,
+		&state.Workflow,
+		&state.Step,
+		&contextJSON,
+		&state.CreatedAt,
+		&state.UpdatedAt,
+		&state.ExpiresAt,
+	)
+
+	if err != nil {
+		return nil, fmt.Errorf("failed to get state: %w", err)
+	}
+
+	if err := json.Unmarshal(contextJSON, &state.Context); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal context: %w", err)
+	}
+
+	return &state, nil
+}
+