bump k-ap 0.5.0, decompose repo traits, LocalObject, ActivityStreamsType enum, split follow modules

crates/adapters/postgres-federation/src/follow/migration.rs

@@ -0,0 +1,27 @@
+use anyhow::Result;
+use async_trait::async_trait;
+use k_ap::FollowMigration;
+
+use crate::PostgresFederationRepository;
+
+#[async_trait]
+impl FollowMigration for PostgresFederationRepository {
+    async fn migrate_follower_actor(
+        &self,
+        old_actor_url: &str,
+        new_actor_url: &str,
+    ) -> Result<Vec<uuid::Uuid>> {
+        let candidates: Vec<String> = sqlx::query_scalar(
+            "SELECT local_user_id FROM ap_following WHERE remote_actor_url = $1 AND local_user_id NOT IN (SELECT local_user_id FROM ap_following WHERE remote_actor_url = $2)",
+        ).bind(old_actor_url).bind(new_actor_url).fetch_all(&self.pool).await?;
+        if candidates.is_empty() {
+            return Ok(vec![]);
+        }
+        sqlx::query("UPDATE ap_following SET remote_actor_url = $1 WHERE remote_actor_url = $2 AND local_user_id NOT IN (SELECT local_user_id FROM ap_following WHERE remote_actor_url = $1)")
+            .bind(new_actor_url).bind(old_actor_url).execute(&self.pool).await?;
+        candidates
+            .into_iter()
+            .map(|s| uuid::Uuid::parse_str(&s).map_err(|e| anyhow::anyhow!(e)))
+            .collect()
+    }
+}