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Add unified posts database groundwork (#2)

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Adds self-referencing post and post-vote tables, generated schema models, and an idempotent snapshot migration that preserves the legacy tables during the staged application cutover.

Co-authored-by: codegirl-007 <s.raide@gmail.com>
This commit was merged in pull request #2.
This commit is contained in:
codegirl007
2026-08-27 07:05:24 +00:00
committed by codegirl007
parent 418ef93da5
commit c5ef15ae1f
4 changed files with 335 additions and 0 deletions
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internal/store/migrate.go
+70
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@@ -35,6 +35,75 @@ CREATE UNIQUE INDEX IF NOT EXISTS users_email_lower_uidx
return nil
}
// migratePosts creates the unified post model and snapshots legacy content.
// Legacy tables remain in place until the application cutover is complete.
func migratePosts(ctx context.Context, exec execContext) error {
steps := []struct {
name string
sql string
}{
{"create posts", `
CREATE TABLE IF NOT EXISTS posts (
id TEXT PRIMARY KEY,
parent_id TEXT REFERENCES posts(id) ON DELETE CASCADE,
author_id TEXT NOT NULL REFERENCES users(id),
title TEXT NOT NULL DEFAULT '',
body TEXT NOT NULL,
city TEXT NOT NULL DEFAULT '',
post_date TEXT NOT NULL DEFAULT '',
hidden INTEGER NOT NULL DEFAULT 0,
created_at TEXT NOT NULL,
updated_at TEXT NOT NULL,
CHECK (
(parent_id IS NULL AND title <> '' AND post_date <> '')
OR
(parent_id IS NOT NULL AND title = '' AND city = '' AND post_date = '' AND hidden = 0)
)
)`},
{"index post replies", `
CREATE INDEX IF NOT EXISTS idx_posts_parent_created
ON posts(parent_id, created_at, id)`},
{"index root posts", `
CREATE INDEX IF NOT EXISTS idx_posts_root_date
ON posts(post_date, hidden)
WHERE parent_id IS NULL`},
{"create post votes", `
CREATE TABLE IF NOT EXISTS post_votes (
user_id TEXT NOT NULL REFERENCES users(id),
post_id TEXT NOT NULL REFERENCES posts(id) ON DELETE CASCADE,
value INTEGER NOT NULL CHECK (value IN (-1, 1)),
PRIMARY KEY (user_id, post_id)
)`},
{"copy questions", `
INSERT INTO posts (
id, parent_id, author_id, title, body, city, post_date, hidden, created_at, updated_at
)
SELECT
id, NULL, author_id, title, body, city, hunt_date, hidden, created_at, created_at
FROM questions
ON CONFLICT (id) DO NOTHING`},
{"copy answers", `
INSERT INTO posts (
id, parent_id, author_id, title, body, city, post_date, hidden, created_at, updated_at
)
SELECT
'answer:' || question_id, question_id, author_id, '', body, '', '', 0, created_at, updated_at
FROM answers
ON CONFLICT (id) DO NOTHING`},
{"copy votes", `
INSERT INTO post_votes (user_id, post_id, value)
SELECT user_id, question_id, value
FROM votes
ON CONFLICT (user_id, post_id) DO NOTHING`},
}
for _, step := range steps {
if _, err := exec.ExecContext(ctx, step.sql); err != nil {
return fmt.Errorf("%s: %w", step.name, err)
}
}
return nil
}
type execContext interface {
ExecContext(ctx context.Context, query string, args ...any) (sql.Result, error)
QueryContext(ctx context.Context, query string, args ...any) (*sql.Rows, error)
@@ -81,6 +150,7 @@ CREATE TABLE IF NOT EXISTS schema_migrations (
}},
{"002_user_profile_columns", migrateUserProfileColumns},
{"003_user_email", migrateUserEmail},
{"004_posts", migratePosts},
}
for _, m := range migrations {
if applied[m.version] {