feat: Implement semantic search and smart note linking with embedding generation, vector storage, and link persistence.

notes-infra/src/link_repository.rs

@@ -0,0 +1,68 @@
+use async_trait::async_trait;
+use sqlx::SqlitePool;
+use uuid::Uuid;
+
+use notes_domain::entities::NoteLink;
+use notes_domain::errors::{DomainError, DomainResult};
+use notes_domain::ports::LinkRepository;
+
+pub struct SqliteLinkRepository {
+    pool: SqlitePool,
+}
+
+impl SqliteLinkRepository {
+    pub fn new(pool: SqlitePool) -> Self {
+        Self { pool }
+    }
+}
+
+#[async_trait]
+impl LinkRepository for SqliteLinkRepository {
+    async fn save_links(&self, links: &[NoteLink]) -> DomainResult<()> {
+        let mut tx = self
+            .pool
+            .begin()
+            .await
+            .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+
+        for link in links {
+            let source = link.source_note_id.to_string();
+            let target = link.target_note_id.to_string();
+            let created_at = link.created_at.to_rfc3339();
+
+            sqlx::query(
+                r#"
+                INSERT INTO note_links (source_note_id, target_note_id, score, created_at)
+                VALUES (?, ?, ?, ?)
+                ON CONFLICT(source_note_id, target_note_id) DO UPDATE SET
+                    score = excluded.score,
+                    created_at = excluded.created_at
+                "#,
+            )
+            .bind(source)
+            .bind(target)
+            .bind(link.score)
+            .bind(created_at)
+            .execute(&mut *tx)
+            .await
+            .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+        }
+
+        tx.commit()
+            .await
+            .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+
+        Ok(())
+    }
+
+    async fn delete_links_for_source(&self, source_note_id: Uuid) -> DomainResult<()> {
+        let source_str = source_note_id.to_string();
+        sqlx::query("DELETE FROM note_links WHERE source_note_id = ?")
+            .bind(source_str)
+            .execute(&self.pool)
+            .await
+            .map_err(|e| DomainError::RepositoryError(e.to_string()))?;
+
+        Ok(())
+    }
+}