Cleaning and coin events

sql/all_elements.pgsql

@@ -0,0 +1,4 @@
+SELECT user_id, arrow_id as elt_id, time, 'arrow' as elt FROM arrowclicked
+UNION
+SELECT user_id, coin_id, time, 'coin' FROM coinclicked
+ORDER BY time;

sql/backup.pgsql

@@ -1,5 +1,6 @@
 DROP TABLE IF EXISTS users CASCADE;
 DROP TABLE IF EXISTS arrowclicked CASCADE;
+DROP TABLE IF EXISTS coinclicked CASCADE;
 
 CREATE TABLE users (
     id SERIAL PRIMARY KEY,
@@ -13,3 +14,9 @@ CREATE TABLE arrowclicked(
     arrow_id INTEGER
 );
 
+CREATE TABLE coinclicked(
+    id SERIAL PRIMARY KEY,
+    user_id SERIAL REFERENCES users (id),
+    time TIMESTAMP DEFAULT NOW(),
+    coin_id INTEGER
+);