Drop the single-database split and re-baseline the control migrations

Every deployment has been through the per-blog split, so the code that
performed it (split.go, control migrations 00002–00007) is dead weight, and a
fresh install replaying six migrations only to drop the tables again was
silly. The control chain is now a single 00001_init.sql with the final users
and blogs shape, matching the blog chain.

Goose ignores versions recorded in the database that no longer exist in the
source, but refuses a future migration numbered below the database's highest
version. Databases that went through the split therefore need
`DELETE FROM goose_db_version WHERE version_id > 1` once; README and
AGENTS.md say so.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Sd8UPWrvyYCLj97JexNw3A

1 files changed, 6 insertions, 49 deletions

diff --git a/internal/db/migrations/control/00001_init.sql b/internal/db/migrations/control/00001_init.sql
index e27dad4..0b26b37 100644
--- a/internal/db/migrations/control/00001_init.sql
+++ b/internal/db/migrations/control/00001_init.sql
@@ -1,4 +1,6 @@
 -- +goose Up
+-- The control database: accounts and the list of blogs. Everything a blog
+-- contains lives in its own database (see migrations/blog).
 CREATE TABLE users (
     id             bigserial PRIMARY KEY,
     username       text NOT NULL UNIQUE,
@@ -9,60 +11,15 @@ CREATE TABLE users (
     created_at     timestamptz NOT NULL DEFAULT now()
 );
 
+-- "blog_" + subdomain must fit a 63-char Postgres identifier, hence 58.
 CREATE TABLE blogs (
     id          bigserial PRIMARY KEY,
     owner_id    bigint NOT NULL UNIQUE REFERENCES users(id) ON DELETE CASCADE,
-    subdomain   text NOT NULL UNIQUE CHECK (subdomain ~ '^[a-z0-9](-?[a-z0-9]){0,62}$'),
-    title       text NOT NULL,
-    tagline     text NOT NULL DEFAULT '',
-    theme       jsonb NOT NULL DEFAULT '{}'::jsonb,
-    created_at  timestamptz NOT NULL DEFAULT now(),
-    updated_at  timestamptz NOT NULL DEFAULT now()
+    subdomain   text NOT NULL UNIQUE CHECK (subdomain ~ '^[a-z0-9](-?[a-z0-9]){0,57}$'),
+    db_name     text NOT NULL UNIQUE,
+    created_at  timestamptz NOT NULL DEFAULT now()
 );
 
-CREATE TABLE pages (
-    id           bigserial PRIMARY KEY,
-    blog_id      bigint NOT NULL REFERENCES blogs(id) ON DELETE CASCADE,
-    slug         text NOT NULL,
-    title        text NOT NULL,
-    intro_md     text NOT NULL DEFAULT '',
-    intro_html   text NOT NULL DEFAULT '',
-    nav_order    integer NOT NULL DEFAULT 0,
-    show_in_nav  boolean NOT NULL DEFAULT true,
-    is_home      boolean NOT NULL DEFAULT false,
-    created_at   timestamptz NOT NULL DEFAULT now(),
-    UNIQUE (blog_id, slug)
-);
-CREATE UNIQUE INDEX pages_one_home_per_blog ON pages (blog_id) WHERE is_home;
-
-CREATE TABLE posts (
-    id          bigserial PRIMARY KEY,
-    page_id     bigint NOT NULL REFERENCES pages(id) ON DELETE CASCADE,
-    slug        text NOT NULL,
-    title       text NOT NULL,
-    body_md     text NOT NULL DEFAULT '',
-    body_html   text NOT NULL DEFAULT '',
-    published   boolean NOT NULL DEFAULT true,
-    created_at  timestamptz NOT NULL DEFAULT now(),
-    updated_at  timestamptz NOT NULL DEFAULT now(),
-    UNIQUE (page_id, slug)
-);
-CREATE INDEX posts_page_created ON posts (page_id, created_at DESC);
-
-CREATE TABLE images (
-    id            uuid PRIMARY KEY,
-    blog_id       bigint NOT NULL REFERENCES blogs(id) ON DELETE CASCADE,
-    filename      text NOT NULL,
-    content_type  text NOT NULL,
-    size          integer NOT NULL,
-    data          bytea NOT NULL,
-    created_at    timestamptz NOT NULL DEFAULT now()
-);
-CREATE INDEX images_blog ON images (blog_id, created_at DESC);
-
 -- +goose Down
-DROP TABLE images;
-DROP TABLE posts;
-DROP TABLE pages;
 DROP TABLE blogs;
 DROP TABLE users;