added Model classes

backend/api/src/Database.ts

@@ -0,0 +1,24 @@
+import pgPromise from "pg-promise";
+
+
+export abstract class Database {
+    static db = null;
+    get db() {
+        if (Database.db == null) {
+            Database.db = pgPromise({})('postgres://postgres:postgres@db:5432/rr')
+        }
+        return Database.db;
+    }
+
+    static async catcher(request): Promise<any> {
+        let data;
+        try {
+            data = await request();
+        } catch (e) {
+            console.log((e as Error).message)
+        }
+        return data;
+    }
+
+
+}