Add database indexes for PR lookup and queue queries

src/migrations/m20260308_200000_add_indexes.rs

@@ -0,0 +1,70 @@
+use rapina::migration::prelude::*;
+use rapina::sea_orm_migration;
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        // Index for PR lookups by repo + number + status (find_queued_pr, find_active_pr)
+        manager
+            .create_index(
+                Index::create()
+                    .name("idx_pr_repo_number_status")
+                    .table(PullRequests::Table)
+                    .col(PullRequests::RepoOwner)
+                    .col(PullRequests::RepoName)
+                    .col(PullRequests::PrNumber)
+                    .col(PullRequests::Status)
+                    .to_owned(),
+            )
+            .await?;
+
+        // Index for queue ordering (get_queue, get_next_queued, dashboard active PRs)
+        manager
+            .create_index(
+                Index::create()
+                    .name("idx_pr_status_priority_queued")
+                    .table(PullRequests::Table)
+                    .col(PullRequests::Status)
+                    .col(PullRequests::Priority)
+                    .col(PullRequests::QueuedAt)
+                    .to_owned(),
+            )
+            .await?;
+
+        Ok(())
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .drop_index(
+                Index::drop()
+                    .name("idx_pr_repo_number_status")
+                    .table(PullRequests::Table)
+                    .to_owned(),
+            )
+            .await?;
+        manager
+            .drop_index(
+                Index::drop()
+                    .name("idx_pr_status_priority_queued")
+                    .table(PullRequests::Table)
+                    .to_owned(),
+            )
+            .await?;
+        Ok(())
+    }
+}
+
+#[derive(DeriveIden)]
+enum PullRequests {
+    Table,
+    RepoOwner,
+    RepoName,
+    PrNumber,
+    Status,
+    Priority,
+    QueuedAt,
+}

src/migrations/mod.rs

@@ -8,10 +8,13 @@ mod m20260307_200000_add_installation_id;
 
 mod m20260308_120000_add_approved_by;
 
+mod m20260308_200000_add_indexes;
+
 rapina::migrations! {
     m20260307_033928_create_pull_requests,
     m20260307_130846_create_batchs,
     m20260307_131338_create_merge_events,
     m20260307_200000_add_installation_id,
     m20260308_120000_add_approved_by,
+    m20260308_200000_add_indexes,
 }