Add indexes to tables.

sql/schema.postgresql.sql

@@ -0,0 +1,37 @@
+create table website (
+    website_id uuid primary key,
+    hostname varchar(255) unique not null,
+    created_at timestamp with time zone default current_timestamp
+);
+
+create table session (
+    session_id uuid primary key,
+    website_id uuid references website(website_id) on delete cascade,
+    created_at timestamp with time zone default current_timestamp,
+    browser varchar(20),
+    os varchar(20),
+    screen varchar(11),
+    language varchar(35),
+    country char(2)
+);
+
+create table pageview (
+    view_id serial primary key,
+    session_id uuid references session(session_id) on delete cascade,
+    created_at timestamp with time zone default current_timestamp,
+    url varchar(500) not null,
+    referrer varchar(500)
+);
+
+create table event (
+    event_id serial primary key,
+    session_id uuid references session(session_id) on delete cascade,
+    created_at timestamp with time zone default current_timestamp,
+    url varchar(500) not null,
+    event_type varchar(50) not null,
+    event_value varchar(255) not null
+);
+
+create index on session(created_at);
+create index on pageview(created_at);
+create index on event(created_at);