improvements

migrations/0001_schema.sql

@@ -4,7 +4,9 @@ CREATE TYPE STAT AS ENUM ('waiting', 'p1turn', 'p2turn');
 CREATE TABLE IF NOT EXISTS players (
     id CHAR(16) PRIMARY KEY,
     board CHAR(10) [10],
-    room_code CHAR(4) NOT NULL
+    room_code CHAR(4) NOT NULL,
+    abandoned BOOLEAN DEFAULT FALSE NOT NULL,
+    time TIMESTAMP DEFAULT NOW() NOT NULL
 );
 
 CREATE TABLE IF NOT EXISTS rooms (
@@ -24,12 +26,6 @@ CREATE TABLE IF NOT EXISTS rooms (
     )
 );
 
-CREATE TABLE IF NOT EXISTS abandoned_players (
-    time TIMESTAMP PRIMARY KEY,
-    id CHAR(16) NOT NULL,
-    CONSTRAINT fk_player_id FOREIGN KEY (id) REFERENCES players (id) ON DELETE CASCADE ON UPDATE CASCADE
-);
-
 ALTER TABLE players
 ADD CONSTRAINT fk_room_code FOREIGN KEY (room_code) REFERENCES rooms (code) ON DELETE
 SET NULL;
@@ -40,22 +36,5 @@ SET NULL ON UPDATE CASCADE,
     ADD CONSTRAINT fk_player2 FOREIGN KEY (player2_id) REFERENCES players (id) ON DELETE
 SET NULL ON UPDATE CASCADE;
 
--- delete room if both players are null
-CREATE OR REPLACE FUNCTION delete_room() RETURNS TRIGGER AS $$ BEGIN IF (
-        SELECT player1_id IS NULL
-            AND player2_id IS NULL
-        FROM rooms
-        WHERE code = OLD.room_code
-    ) THEN
-DELETE FROM rooms
-WHERE code = OLD.room_code;
-END IF;
-RETURN OLD;
-END;
-$$ LANGUAGE plpgsql;
-
-CREATE TRIGGER delete_room_trigger
-AFTER DELETE ON players FOR EACH ROW EXECUTE FUNCTION delete_room();
-
 CREATE INDEX idx_player_room_code ON players (room_code);
-CREATE INDEX idx_room_status ON rooms (stat);
+CREATE INDEX idx_room_status ON players (abandoned);

migrations/0002_triggers.sql

@@ -0,0 +1,39 @@
+-- delete room if both players are null
+CREATE OR REPLACE FUNCTION delete_room() RETURNS TRIGGER AS $$ BEGIN IF (
+        SELECT player1_id IS NULL
+            AND player2_id IS NULL
+        FROM rooms
+        WHERE code = OLD.room_code
+    ) THEN
+DELETE FROM rooms
+WHERE code = OLD.room_code;
+END IF;
+RETURN OLD;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER delete_room_trigger
+AFTER DELETE ON players FOR EACH ROW EXECUTE FUNCTION delete_room();
+
+
+-- retain only 1000 recent abandoned players according to timestamp
+CREATE OR REPLACE FUNCTION delete_player() RETURNS TRIGGER AS $$ BEGIN IF (
+        SELECT COUNT(*)
+        FROM players
+        WHERE abandoned = TRUE
+    ) > 10000 THEN
+DELETE FROM players
+WHERE id IN (
+        SELECT id
+        FROM players
+        WHERE abandoned = TRUE
+        ORDER BY time DESC OFFSET 10000
+    );
+END IF;
+RETURN OLD;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER delete_player_trigger
+AFTER
+INSERT ON players FOR EACH ROW EXECUTE FUNCTION delete_player();