Use int for hits.width, rather than smallint

I've been getting the occasional "value [..] is out of range for type
smallint" errors. There's very few of these:

    =# with x as (
	    select width, count(width) from size_stats where width >=30000 group by width
    )
    select * from x order by count desc;
     width │ count
    ───────┼───────
     38400 │    20
     34910 │     7
     32002 │     5
     42668 │     5
     48000 │     3
     41280 │     3
     34400 │     3
     31200 │     2
     39386 │     2
     38134 │     1
     34630 │     1
     38048 │     1
     30800 │     1
     42900 │     1

The widest screen generally available is 7680x2160. 38400 is 7680 x 5,
which probably isn't a coincidence(?)

Anyway, just use an int. Not worth the 2 bytes it saves, and size_stats
already uses int.

Author: arp242

db/migrate/2026-02-13-1-hits-width-postgres.sql

@@ -0,0 +1 @@
+alter table hits alter column width type int;

db/migrate/2026-02-13-1-hits-width-sqlite.sql

@@ -0,0 +1,27 @@
+create table hits_new (
+	hit_id         integer primary key autoincrement,
+	site_id        integer        not null,
+	path_id        integer        not null,
+	ref_id         integer        not null default 1,
+
+	session        blob           default null,
+	first_visit    integer        default 0,
+
+	browser_id     integer        not null,
+	system_id      integer        not null,
+	campaign       integer        default null,
+	width          int            null,
+	location       varchar        not null default '',
+	language       varchar,
+
+	created_at     timestamp      not null              check(created_at = strftime('%Y-%m-%d %H:%M:%S', created_at))
+);
+
+insert into hits_new (hit_id, site_id, path_id, ref_id, session, first_visit, browser_id, system_id, campaign, width, location, language, created_at)
+	select hit_id, site_id, path_id, ref_id, session, first_visit, browser_id, system_id, campaign, width, location, language, created_at
+	from hits;
+
+drop table hits;
+
+alter table hits_new rename to hits;
+create index "hits#site_id#created_at" on hits(site_id, created_at desc);