diff --git a/src/memory_manager/db/repository.py b/src/memory_manager/db/repository.py
new file mode 100644
index 0000000..f7f15e1
--- /dev/null
+++ b/src/memory_manager/db/repository.py
@@ -0,0 +1,239 @@
+"""Async repository for memory entries and commits."""
+import hashlib
+import json
+from datetime import datetime
+from typing import List, Optional
+
+from sqlalchemy import select, func
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine, async_sessionmaker
+from sqlalchemy.orm import selectinload
+
+from memory_manager.db.models import Base, MemoryEntry, Commit, CommitEntry, MemoryCategory
+
+
+class MemoryRepository:
+    def __init__(self, db_path: str):
+        self.db_path = db_path
+        self.engine = create_async_engine(f"sqlite+aiosqlite:///{db_path}", echo=False)
+        self.async_session = async_sessionmaker(self.engine, class_=AsyncSession)
+
+    async def init_db(self):
+        async with self.engine.begin() as conn:
+            await conn.run_sync(Base.metadata.create_all)
+
+    async def close(self):
+        await self.engine.dispose()
+
+    async def create_entry(
+        self,
+        title: str,
+        content: str,
+        category: MemoryCategory,
+        tags: List[str],
+        agent_id: str,
+        project_path: str,
+        parent_id: Optional[int] = None,
+    ) -> MemoryEntry:
+        async with self.async_session() as session:
+            entry = MemoryEntry(
+                title=title,
+                content=content,
+                category=category,
+                tags=tags,
+                agent_id=agent_id,
+                project_path=project_path,
+                parent_id=parent_id,
+            )
+            session.add(entry)
+            await session.commit()
+            await session.refresh(entry)
+            return entry
+
+    async def get_entry(self, entry_id: int) -> Optional[MemoryEntry]:
+        async with self.async_session() as session:
+            result = await session.execute(
+                select(MemoryEntry).where(MemoryEntry.id == entry_id)
+            )
+            return result.scalar_one_or_none()
+
+    async def list_entries(
+        self,
+        category: Optional[MemoryCategory] = None,
+        agent_id: Optional[str] = None,
+        limit: int = 100,
+        offset: int = 0,
+    ) -> List[MemoryEntry]:
+        async with self.async_session() as session:
+            query = select(MemoryEntry)
+            if category:
+                query = query.where(MemoryEntry.category == category)
+            if agent_id:
+                query = query.where(MemoryEntry.agent_id == agent_id)
+            query = query.order_by(MemoryEntry.created_at.desc()).limit(limit).offset(offset)
+            result = await session.execute(query)
+            return list(result.scalars().all())
+
+    async def update_entry(
+        self,
+        entry_id: int,
+        title: Optional[str] = None,
+        content: Optional[str] = None,
+        category: Optional[MemoryCategory] = None,
+        tags: Optional[List[str]] = None,
+    ) -> Optional[MemoryEntry]:
+        async with self.async_session() as session:
+            result = await session.execute(
+                select(MemoryEntry).where(MemoryEntry.id == entry_id)
+            )
+            entry = result.scalar_one_or_none()
+            if not entry:
+                return None
+            if title is not None:
+                entry.title = title
+            if content is not None:
+                entry.content = content
+            if category is not None:
+                entry.category = category
+            if tags is not None:
+                entry.tags = tags
+            entry.updated_at = datetime.utcnow()
+            await session.commit()
+            await session.refresh(entry)
+            return entry
+
+    async def delete_entry(self, entry_id: int) -> bool:
+        async with self.async_session() as session:
+            result = await session.execute(
+                select(MemoryEntry).where(MemoryEntry.id == entry_id)
+            )
+            entry = result.scalar_one_or_none()
+            if not entry:
+                return False
+            await session.delete(entry)
+            await session.commit()
+            return True
+
+    async def search_entries(
+        self,
+        query: str,
+        category: Optional[MemoryCategory] = None,
+        tags: Optional[List[str]] = None,
+    ) -> List[MemoryEntry]:
+        async with self.async_session() as session:
+            search_pattern = f"%{query}%"
+            stmt = select(MemoryEntry).where(
+                (MemoryEntry.title.like(search_pattern)) |
+                (MemoryEntry.content.like(search_pattern))
+            )
+            if category:
+                stmt = stmt.where(MemoryEntry.category == category)
+            if tags:
+                for tag in tags:
+                    stmt = stmt.where(MemoryEntry.tags.contains([tag]))
+            stmt = stmt.order_by(MemoryEntry.created_at.desc())
+            result = await session.execute(stmt)
+            return list(result.scalars().all())
+
+    async def create_commit(
+        self,
+        message: str,
+        agent_id: str,
+        project_path: str,
+    ) -> Commit:
+        async with self.async_session() as session:
+            entries_result = await session.execute(select(MemoryEntry))
+            entries = list(entries_result.scalars().all())
+
+            entries_snapshot = []
+            for entry in entries:
+                entries_snapshot.append({
+                    "id": entry.id,
+                    "title": entry.title,
+                    "content": entry.content,
+                    "category": entry.category.value,
+                    "tags": entry.tags,
+                    "agent_id": entry.agent_id,
+                    "project_path": entry.project_path,
+                })
+
+            snapshot_json = json.dumps(entries_snapshot, sort_keys=True)
+            commit_hash = hashlib.sha1(
+                f"{snapshot_json}{datetime.utcnow().isoformat()}".encode()
+            ).hexdigest()
+
+            commit = Commit(
+                hash=commit_hash,
+                message=message,
+                agent_id=agent_id,
+                project_path=project_path,
+            )
+            session.add(commit)
+            await session.flush()
+
+            for entry in entries:
+                commit_entry = CommitEntry(
+                    commit_id=commit.id,
+                    memory_entry_id=entry.id,
+                    entry_snapshot={
+                        "id": entry.id,
+                        "title": entry.title,
+                        "content": entry.content,
+                        "category": entry.category.value,
+                        "tags": entry.tags,
+                        "agent_id": entry.agent_id,
+                    },
+                )
+                session.add(commit_entry)
+
+            await session.commit()
+            await session.refresh(commit)
+            return commit
+
+    async def get_commits(self, limit: int = 50) -> List[Commit]:
+        async with self.async_session() as session:
+            result = await session.execute(
+                select(Commit).order_by(Commit.created_at.desc()).limit(limit)
+            )
+            return list(result.scalars().all())
+
+    async def get_commit(self, commit_hash: str) -> Optional[Commit]:
+        async with self.async_session() as session:
+            result = await session.execute(
+                select(Commit).where(Commit.hash == commit_hash)
+            )
+            return result.scalar_one_or_none()
+
+    async def get_commit_entries(self, commit_hash: str) -> List[CommitEntry]:
+        async with self.async_session() as session:
+            commit_result = await session.execute(
+                select(Commit).where(Commit.hash == commit_hash)
+            )
+            commit = commit_result.scalar_one_or_none()
+            if not commit:
+                return []
+            result = await session.execute(
+                select(CommitEntry)
+                .options(selectinload(CommitEntry.memory_entry))
+                .where(CommitEntry.commit_id == commit.id)
+            )
+            return list(result.scalars().all())
+
+    async def get_stats(self) -> dict:
+        async with self.async_session() as session:
+            total_entries = await session.scalar(select(func.count(MemoryEntry.id)))
+            total_commits = await session.scalar(select(func.count(Commit.id)))
+
+            category_counts = {}
+            for category in MemoryCategory:
+                count = await session.scalar(
+                    select(func.count(MemoryEntry.id)).where(
+                        MemoryEntry.category == category
+                    )
+                )
+                category_counts[category.value] = count or 0
+
+            return {
+                "total_entries": total_entries or 0,
+                "total_commits": total_commits or 0,
+                "category_counts": category_counts,
+            }