add request_chat table for requesting access to download for chats

migrations/1_init.sql

@@ -48,4 +48,25 @@ AFTER UPDATE OF is_approved ON "request"
 WHEN new.is_approved = 1
 BEGIN
     UPDATE user SET can_download = 1 WHERE user.id = new.requested_by;
+END;
+
+CREATE TABLE "request_chat"
+(
+    id                  INTEGER PRIMARY KEY AUTOINCREMENT,
+    requested_by        INTEGER NOT NULL UNIQUE,
+    requested_for       INTEGER NOT NULL UNIQUE,
+    approved_by         INTEGER UNIQUE,
+    message             TEXT,
+    is_approved         INTEGER NOT NULL,
+
+    FOREIGN KEY(requested_by)   REFERENCES "user"(id),
+    FOREIGN KEY(requested_for)  REFERENCES "chat"(id),
+    FOREIGN KEY(approved_by)    REFERENCES "user"(id)
+);
+
+CREATE TRIGGER "approve_chat"
+AFTER UPDATE OF is_approved ON "request_chat"
+WHEN new.is_approved = 1
+BEGIN
+    UPDATE chat SET can_download = 1 WHERE chat.id = new.requested_for;
 END;

src/db.rs

@@ -73,6 +73,16 @@ pub struct Request {
     pub is_approved: i64,
 }
 
+#[derive(sqlx::FromRow)]
+pub struct RequestChat {
+    pub id: i64,
+    pub requested_by: i64,
+    pub requested_for: i64,
+    pub approved_by: Option<i64>,
+    pub message: Option<String>,
+    pub is_approved: i64,
+}
+
 pub async fn db_init() -> SqlitePool {
     let db_url = make_database_url();
     if !Sqlite::database_exists(&db_url).await.unwrap_or(false) {