feat(memory): add RAG memory store and self-memory system (promises, strategies)

internal/memory/store.go

@@ -0,0 +1,71 @@
+package memory
+
+import (
+	"context"
+	"log/slog"
+	"sync"
+	"time"
+
+	"git.db123.ir/db123/divacode/internal/storage"
+)
+
+type Store struct {
+	mu sync.Mutex
+	db *storage.DB
+}
+
+func NewStore(db *storage.DB) *Store {
+	return &Store{db: db}
+}
+
+func (s *Store) Store(ctx context.Context, content string, source string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	importance := 0.5
+	if len(content) > 100 {
+		importance = 0.7
+	}
+
+	id := time.Now().Format("150405.000000000")
+	return s.db.Exec(
+		"INSERT INTO memories (id, content, importance, source, created_at) VALUES (?, ?, ?, ?, datetime('now'))",
+		id, content, importance, source,
+	)
+}
+
+func (s *Store) Search(ctx context.Context, query string, topK int) ([]string, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	rows, err := s.db.Query(
+		`SELECT content FROM memories
+		 WHERE content LIKE ?
+		 ORDER BY importance DESC, created_at DESC
+		 LIMIT ?`,
+		"%"+query+"%", topK,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var results []string
+	for rows.Next() {
+		var content string
+		if err := rows.Scan(&content); err != nil {
+			continue
+		}
+		results = append(results, content)
+	}
+
+	slog.Debug("memory search", "query", query, "results", len(results))
+	return results, nil
+}
+
+func (s *Store) UpdateImportance(ctx context.Context, id string, importance float64) error {
+	return s.db.Exec(
+		"UPDATE memories SET importance = ?, last_accessed = datetime('now') WHERE id = ?",
+		importance, id,
+	)
+}