chore: reorganize project into monorepo

backend/migration/src/m20260328_000004_add_posts_search_index.rs

@@ -0,0 +1,46 @@
+use sea_orm_migration::prelude::*;
+use sea_orm_migration::sea_orm::DbBackend;
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        if manager.get_database_backend() != DbBackend::Postgres {
+            return Ok(());
+        }
+
+        manager
+            .get_connection()
+            .execute_unprepared(
+                r#"
+                CREATE INDEX IF NOT EXISTS idx_posts_search_fts
+                ON posts
+                USING GIN (
+                    (
+                        setweight(to_tsvector('simple', coalesce(title, '')), 'A') ||
+                        setweight(to_tsvector('simple', coalesce(description, '')), 'B') ||
+                        setweight(to_tsvector('simple', coalesce(category, '')), 'C') ||
+                        setweight(to_tsvector('simple', coalesce(tags::text, '')), 'C') ||
+                        setweight(to_tsvector('simple', coalesce(content, '')), 'D')
+                    )
+                );
+                "#,
+            )
+            .await?;
+        Ok(())
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        if manager.get_database_backend() != DbBackend::Postgres {
+            return Ok(());
+        }
+
+        manager
+            .get_connection()
+            .execute_unprepared("DROP INDEX IF EXISTS idx_posts_search_fts;")
+            .await?;
+        Ok(())
+    }
+}