making it AP complaint

crates/adapters/sqlite-federation/src/activity.rs

@@ -0,0 +1,27 @@
+use anyhow::Result;
+use async_trait::async_trait;
+use chrono::Utc;
+use k_ap::ActivityRepository;
+
+use super::{SqliteFederationRepository, datetime_to_str};
+
+#[async_trait]
+impl ActivityRepository for SqliteFederationRepository {
+    async fn is_activity_processed(&self, activity_id: &str) -> Result<bool> {
+        let count: i64 = sqlx::query_scalar("SELECT COUNT(*) FROM ap_activities WHERE id = ?1")
+            .bind(activity_id)
+            .fetch_one(&self.pool)
+            .await?;
+        Ok(count > 0)
+    }
+
+    async fn mark_activity_processed(&self, activity_id: &str) -> Result<()> {
+        let ts = datetime_to_str(&Utc::now().naive_utc());
+        sqlx::query("INSERT OR IGNORE INTO ap_activities (id, processed_at) VALUES (?1, ?2)")
+            .bind(activity_id)
+            .bind(&ts)
+            .execute(&self.pool)
+            .await?;
+        Ok(())
+    }
+}