feat(reminder): add logic for allow staff to ping a role from a reminder

Author: Akinator31

crates/rustmail/src/db/operations/reminder_optouts.rs

@@ -0,0 +1,83 @@
+use crate::prelude::errors::*;
+
+pub async fn insert_reminder_optout(
+    guild_id: i64,
+    user_id: i64,
+    role_id: i64,
+    pool: &sqlx::SqlitePool,
+) -> ModmailResult<()> {
+    sqlx::query!(
+        r#"
+        INSERT OR IGNORE INTO reminder_optouts (guild_id, user_id, role_id)
+        VALUES (?, ?, ?)
+        "#,
+        guild_id,
+        user_id,
+        role_id
+    )
+    .execute(pool)
+    .await?;
+
+    Ok(())
+}
+
+pub async fn delete_reminder_optout(
+    guild_id: i64,
+    user_id: i64,
+    role_id: i64,
+    pool: &sqlx::SqlitePool,
+) -> ModmailResult<bool> {
+    let result = sqlx::query!(
+        r#"
+        DELETE FROM reminder_optouts
+        WHERE guild_id = ? AND user_id = ? AND role_id = ?
+        "#,
+        guild_id,
+        user_id,
+        role_id
+    )
+    .execute(pool)
+    .await?;
+
+    Ok(result.rows_affected() > 0)
+}
+
+pub async fn get_optouts_for_role(
+    guild_id: i64,
+    role_id: i64,
+    pool: &sqlx::SqlitePool,
+) -> ModmailResult<Vec<i64>> {
+    let rows = sqlx::query_scalar!(
+        r#"
+        SELECT user_id FROM reminder_optouts
+        WHERE guild_id = ? AND role_id = ?
+        "#,
+        guild_id,
+        role_id
+    )
+    .fetch_all(pool)
+    .await?;
+
+    Ok(rows)
+}
+
+pub async fn is_user_opted_out(
+    guild_id: i64,
+    user_id: i64,
+    role_id: i64,
+    pool: &sqlx::SqlitePool,
+) -> ModmailResult<bool> {
+    let result = sqlx::query!(
+        r#"
+        SELECT id FROM reminder_optouts
+        WHERE guild_id = ? AND user_id = ? AND role_id = ?
+        "#,
+        guild_id,
+        user_id,
+        role_id
+    )
+    .fetch_optional(pool)
+    .await?;
+
+    Ok(result.is_some())
+}