db views now enumerate rows

backend/db/initScripts/_createSchema.sql

@@ -0,0 +1,32 @@
+CREATE TABLE "user" (
+    username VARCHAR(32) PRIMARY KEY
+);
+
+CREATE TABLE game (
+    id SERIAL PRIMARY KEY,
+    score INTEGER NOT NULL,
+    playtime TIME NOT NULL,
+    date DATE NOT NULL,
+    username VARCHAR(32) NOT NULL,
+    FOREIGN KEY (username) REFERENCES "user"
+);
+
+CREATE VIEW user_data AS (
+    SELECT
+        username,
+        max(score) AS highscore,
+        sum(score) AS total_score,
+        sum(playtime) AS total_playtime,
+        avg(score) AS average_score,
+        count(*) AS games_played
+    FROM game
+    GROUP BY username
+);
+
+CREATE VIEW lb_highscore AS (
+    SELECT row_number() OVER (ORDER BY max(score) DESC) AS rank, username, max(score) AS highscore FROM game GROUP BY username ORDER BY rank
+);
+
+CREATE VIEW lb_total_playtime AS (
+    SELECT row_number() OVER (ORDER BY sum(playtime) DESC) AS rank, username, sum(playtime) AS total_playtime FROM game GROUP BY username ORDER BY rank
+);