db/queries/posts.sql

@@ -1,6 +1,6 @@
 -- name: CreatePost :exec
 INSERT INTO posts (
-  id, parent_id, author_id, title, body, city, post_date, hidden, created_at, updated_at
+  id, parent_id, author_id, title, body, city, post_date, post_state, created_at, updated_at
 )
 VALUES (
   sqlc.arg(id),
@@ -10,7 +10,7 @@ VALUES (
   sqlc.arg(body),
   sqlc.arg(city),
   sqlc.arg(post_date),
-  sqlc.arg(hidden),
+  sqlc.arg(post_state),
   sqlc.arg(created_at),
   sqlc.arg(updated_at)
 );
@@ -18,7 +18,7 @@ VALUES (
 -- name: GetPost :one
 SELECT
   p.id, p.parent_id, p.author_id, u.name AS author_name, u.role AS author_role,
-  p.title, p.body, p.city, p.post_date, p.hidden, p.created_at, p.updated_at
+  p.title, p.body, p.city, p.post_date, p.post_state, p.created_at, p.updated_at
 FROM posts p
 JOIN users u ON u.id = p.author_id
 WHERE p.id = sqlc.arg(id);
@@ -39,7 +39,7 @@ SELECT
   thread.id, thread.parent_id, thread.author_id,
   u.name AS author_name, u.role AS author_role,
   thread.title, thread.body, thread.city, thread.post_date,
-  thread.hidden, thread.created_at, thread.updated_at
+  thread.post_state, thread.created_at, thread.updated_at
 FROM thread
 JOIN users u ON u.id = thread.author_id
 ORDER BY thread.created_at, thread.id;
@@ -57,7 +57,7 @@ WITH RECURSIVE roots AS (
   FROM posts p
   WHERE p.parent_id IS NULL
     AND p.post_date = sqlc.arg(post_date)
-    AND p.hidden = 0
+    AND p.post_state <> sqlc.arg(hidden_state)
 ),
 thread AS (
   SELECT roots.id AS root_id, child.id AS post_id, child.author_id
@@ -86,7 +86,7 @@ SELECT
   roots.id, roots.parent_id, roots.author_id,
   u.name AS author_name, u.role AS author_role,
   roots.title, roots.body, roots.city, roots.post_date,
-  roots.hidden, roots.created_at, roots.updated_at,
+  roots.post_state, roots.created_at, roots.updated_at,
   COALESCE(scores.score, 0)::bigint AS score,
   (answered.root_id IS NOT NULL)::bool AS answered,
   COALESCE(viewer_vote.value, 0)::bigint AS user_vote
@@ -104,7 +104,9 @@ LIMIT sqlc.arg(row_limit);
 SELECT EXISTS(
   SELECT 1
   FROM posts
-  WHERE id = sqlc.arg(id) AND parent_id IS NULL AND hidden = 0
+  WHERE id = sqlc.arg(id)
+    AND parent_id IS NULL
+    AND post_state <> sqlc.arg(hidden_state)
 )::bool;
 
 -- name: DeletePostVote :exec
@@ -118,6 +120,6 @@ SELECT sqlc.arg(user_id), sqlc.arg(post_id), sqlc.arg(value)
 FROM posts p
 WHERE p.id = sqlc.arg(post_id)
   AND p.parent_id IS NULL
-  AND p.hidden = 0
+  AND p.post_state <> sqlc.arg(hidden_state)
 ON CONFLICT (user_id, post_id) DO UPDATE
 SET value = excluded.value;

internal/store/memory.go

@@ -463,7 +463,7 @@ func (m *Memory) ListRootPosts(_ context.Context, postDate, viewerID string) ([]
 	defer m.mu.Unlock()
 	posts := make([]Post, 0)
 	for _, post := range m.posts {
-		if post.ParentID != nil || post.PostDate != postDate || post.Hidden {
+		if post.ParentID != nil || post.PostDate != postDate || post.PostState == PostStateHidden {
 			continue
 		}
 		cp := clonePostWithAuthor(post, m.users)
@@ -496,7 +496,7 @@ func (m *Memory) VotePost(_ context.Context, userID, postID string, value int) e
 		return fmt.Errorf("invalid vote")
 	}
 	post, ok := m.posts[postID]
-	if !ok || post.ParentID != nil || post.Hidden {
+	if !ok || post.ParentID != nil || post.PostState == PostStateHidden {
 		return ErrPostNotVotable
 	}
 	if m.postVotes[postID] == nil {

internal/store/migrate.go

@@ -41,8 +41,9 @@ func migratePosts(ctx context.Context, exec execContext) error {
 	steps := []struct {
 		name string
 		sql  string
+		args []any
 	}{
-		{"create posts", `
+		{name: "create posts", sql: `
 CREATE TABLE IF NOT EXISTS posts (
   id TEXT PRIMARY KEY,
   parent_id TEXT REFERENCES posts(id) ON DELETE CASCADE,
@@ -51,53 +52,56 @@ CREATE TABLE IF NOT EXISTS posts (
   body TEXT NOT NULL,
   city TEXT NOT NULL DEFAULT '',
   post_date TEXT NOT NULL DEFAULT '',
-  hidden INTEGER NOT NULL DEFAULT 0,
+  post_state TEXT NOT NULL,
   created_at TEXT NOT NULL,
   updated_at TEXT NOT NULL,
-  CHECK (
+  CONSTRAINT posts_shape_check 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)
+    (parent_id IS NOT NULL AND title = '' AND city = '' AND post_date = '')
   )
 )`},
-		{"index post replies", `
+		{name: "index post replies", sql: `
 CREATE INDEX IF NOT EXISTS idx_posts_parent_created
   ON posts(parent_id, created_at, id)`},
-		{"index root posts", `
+		{name: "index root posts", sql: `
 CREATE INDEX IF NOT EXISTS idx_posts_root_date
-  ON posts(post_date, hidden)
+  ON posts(post_date, post_state)
   WHERE parent_id IS NULL`},
-		{"create post votes", `
+		{name: "create post votes", sql: `
 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", `
+		{name: "copy questions", sql: `
 INSERT INTO posts (
-  id, parent_id, author_id, title, body, city, post_date, hidden, created_at, updated_at
+  id, parent_id, author_id, title, body, city, post_date, post_state, created_at, updated_at
 )
 SELECT
-  id, NULL, author_id, title, body, city, hunt_date, hidden, created_at, created_at
+  id, NULL, author_id, title, body, city, hunt_date,
+  CASE WHEN hidden = 0 THEN $1 ELSE $2 END,
+  created_at, created_at
 FROM questions
-ON CONFLICT (id) DO NOTHING`},
-		{"copy answers", `
+ON CONFLICT (id) DO NOTHING`, args: []any{string(PostStateVisible), string(PostStateHidden)}},
+		{name: "copy answers", sql: `
 INSERT INTO posts (
-  id, parent_id, author_id, title, body, city, post_date, hidden, created_at, updated_at
+  id, parent_id, author_id, title, body, city, post_date, post_state, created_at, updated_at
 )
 SELECT
-  'answer:' || question_id, question_id, author_id, '', body, '', '', 0, created_at, updated_at
+  'answer:' || question_id, question_id, author_id, '', body, '', '',
+  $1, created_at, updated_at
 FROM answers
-ON CONFLICT (id) DO NOTHING`},
-		{"copy votes", `
+ON CONFLICT (id) DO NOTHING`, args: []any{string(PostStateVisible)}},
+		{name: "copy votes", sql: `
 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 {
+		if _, err := exec.ExecContext(ctx, step.sql, step.args...); err != nil {
 			return fmt.Errorf("%s: %w", step.name, err)
 		}
 	}
@@ -141,8 +145,79 @@ $migration$`},
 		{"drop legacy root date index", `
 DROP INDEX IF EXISTS idx_posts_root_hunt`},
 		{"create root date index", `
-CREATE INDEX IF NOT EXISTS idx_posts_root_date
-  ON posts(post_date, hidden)
+DO $migration$
+BEGIN
+  IF EXISTS (
+    SELECT 1
+    FROM information_schema.columns
+    WHERE table_schema = current_schema()
+      AND table_name = 'posts'
+      AND column_name = 'post_state'
+  ) THEN
+    CREATE INDEX IF NOT EXISTS idx_posts_root_date
+      ON posts(post_date, post_state)
+      WHERE parent_id IS NULL;
+  ELSE
+    CREATE INDEX IF NOT EXISTS idx_posts_root_date
+      ON posts(post_date, hidden)
+      WHERE parent_id IS NULL;
+  END IF;
+END
+$migration$`},
+	}
+	for _, step := range steps {
+		if _, err := exec.ExecContext(ctx, step.sql); err != nil {
+			return fmt.Errorf("%s: %w", step.name, err)
+		}
+	}
+	return nil
+}
+
+func migratePostState(ctx context.Context, exec execContext) error {
+	if _, err := exec.ExecContext(ctx, `
+ALTER TABLE posts
+  ADD COLUMN IF NOT EXISTS post_state TEXT`); err != nil {
+		return fmt.Errorf("add post state: %w", err)
+	}
+	hasHidden, err := migrationColumnExists(ctx, exec, "posts", "hidden")
+	if err != nil {
+		return fmt.Errorf("check hidden column: %w", err)
+	}
+	if hasHidden {
+		if _, err := exec.ExecContext(ctx, `
+UPDATE posts
+SET post_state = CASE
+  WHEN hidden = 0 THEN $1
+  ELSE $2
+END`, string(PostStateVisible), string(PostStateHidden)); err != nil {
+			return fmt.Errorf("copy hidden state: %w", err)
+		}
+	}
+
+	steps := []struct {
+		name string
+		sql  string
+	}{
+		{"drop root date index", `
+DROP INDEX IF EXISTS idx_posts_root_date`},
+		{"drop legacy post shape constraint", `
+ALTER TABLE posts DROP CONSTRAINT IF EXISTS posts_check`},
+		{"drop post shape constraint", `
+ALTER TABLE posts DROP CONSTRAINT IF EXISTS posts_shape_check`},
+		{"drop hidden", `
+ALTER TABLE posts DROP COLUMN IF EXISTS hidden`},
+		{"require post state", `
+ALTER TABLE posts ALTER COLUMN post_state SET NOT NULL`},
+		{"create post shape constraint", `
+ALTER TABLE posts
+  ADD CONSTRAINT posts_shape_check CHECK (
+    (parent_id IS NULL AND title <> '' AND post_date <> '')
+    OR
+    (parent_id IS NOT NULL AND title = '' AND city = '' AND post_date = '')
+  )`},
+		{"create root date index", `
+CREATE INDEX idx_posts_root_date
+  ON posts(post_date, post_state)
   WHERE parent_id IS NULL`},
 	}
 	for _, step := range steps {
@@ -153,6 +228,34 @@ CREATE INDEX IF NOT EXISTS idx_posts_root_date
 	return nil
 }
 
+func migrationColumnExists(
+	ctx context.Context,
+	exec execContext,
+	tableName string,
+	columnName string,
+) (bool, error) {
+	rows, err := exec.QueryContext(ctx, `
+SELECT EXISTS (
+  SELECT 1
+  FROM information_schema.columns
+  WHERE table_schema = current_schema()
+    AND table_name = $1
+    AND column_name = $2
+)`, tableName, columnName)
+	if err != nil {
+		return false, err
+	}
+	defer rows.Close()
+	if !rows.Next() {
+		return false, rows.Err()
+	}
+	var exists bool
+	if err := rows.Scan(&exists); err != nil {
+		return false, err
+	}
+	return exists, rows.Err()
+}
+
 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)
@@ -202,6 +305,7 @@ CREATE TABLE IF NOT EXISTS schema_migrations (
 		{"004_posts", migratePosts},
 		{"005_post_vote_post_id_index", migratePostVoteIndex},
 		{"006_post_date", migratePostDate},
+		{"007_post_state", migratePostState},
 	}
 	for _, m := range migrations {
 		if applied[m.version] {

internal/store/migrate_posts_test.go

@@ -145,9 +145,9 @@ VALUES ('homeowner', 'question-1', -1)`); err == nil {
 	}
 
 	var rootParent sql.NullString
-	var rootAuthor, title, rootBody, city, postDate, rootCreated, rootUpdated string
+	var rootAuthor, title, rootBody, city, postDate, rootState, rootCreated, rootUpdated string
 	if err := conn.QueryRowContext(ctx, `
-SELECT parent_id, author_id, title, body, city, post_date, created_at, updated_at
+SELECT parent_id, author_id, title, body, city, post_date, post_state, created_at, updated_at
 FROM posts
 WHERE id = 'question-1'`).Scan(
 		&rootParent,
@@ -156,6 +156,7 @@ WHERE id = 'question-1'`).Scan(
 		&rootBody,
 		&city,
 		&postDate,
+		&rootState,
 		&rootCreated,
 		&rootUpdated,
 	); err != nil {
@@ -167,19 +168,21 @@ WHERE id = 'question-1'`).Scan(
 		rootBody != "It drips." ||
 		city != "Oakland" ||
 		postDate != "2026-08-26" ||
+		rootState != "visible" ||
 		rootCreated != "2026-08-26T08:00:00Z" ||
 		rootUpdated != rootCreated {
 		t.Fatalf("unexpected root post")
 	}
 
-	var replyParent, replyAuthor, replyBody, replyCreated, replyUpdated string
+	var replyParent, replyAuthor, replyBody, replyState, replyCreated, replyUpdated string
 	if err := conn.QueryRowContext(ctx, `
-SELECT parent_id, author_id, body, created_at, updated_at
+SELECT parent_id, author_id, body, post_state, created_at, updated_at
 FROM posts
 WHERE id = 'answer:question-1'`).Scan(
 		&replyParent,
 		&replyAuthor,
 		&replyBody,
+		&replyState,
 		&replyCreated,
 		&replyUpdated,
 	); err != nil {
@@ -188,6 +191,7 @@ WHERE id = 'answer:question-1'`).Scan(
 	if replyParent != "question-1" ||
 		replyAuthor != "plumber" ||
 		replyBody != "Replace the cartridge." ||
+		replyState != "visible" ||
 		replyCreated != "2026-08-26T09:00:00Z" ||
 		replyUpdated != "2026-08-26T09:05:00Z" {
 		t.Fatalf("unexpected reply post")
@@ -205,9 +209,10 @@ WHERE user_id = 'homeowner' AND post_id = 'question-1'`).Scan(&voteValue); err !
 
 	if _, err := conn.ExecContext(ctx, `
 INSERT INTO posts (
-  id, parent_id, author_id, title, body, city, post_date, hidden, created_at, updated_at
+  id, parent_id, author_id, title, body, city, post_date, post_state, created_at, updated_at
 ) VALUES (
-  'invalid-reply', 'question-1', 'homeowner', 'Replies cannot have titles', 'Body', '', '', 0, 'now', 'now'
+  'invalid-reply', 'question-1', 'homeowner', 'Replies cannot have titles', 'Body', '', '',
+  'visible', 'now', 'now'
 )`); err == nil {
 		t.Fatal("reply with root-only title unexpectedly succeeded")
 	}
@@ -218,6 +223,7 @@ INSERT INTO posts (
 		ParentID:  sql.NullString{String: "answer:question-1", Valid: true},
 		AuthorID:  "homeowner",
 		Body:      "It is still dripping.",
+		PostState: string(PostStateVisible),
 		CreatedAt: "2026-08-26T10:00:00Z",
 		UpdatedAt: "2026-08-26T10:00:00Z",
 	}); err != nil {
@@ -248,16 +254,18 @@ INSERT INTO posts (
 		t.Fatalf("update rows=%d error=%v", n, err)
 	}
 	if n, err := queries.UpsertPostVoteOnVisibleRoot(ctx, sqlc.UpsertPostVoteOnVisibleRootParams{
-		UserID: "plumber",
-		PostID: "question-1",
-		Value:  1,
+		UserID:      "plumber",
+		PostID:      "question-1",
+		Value:       1,
+		HiddenState: string(PostStateHidden),
 	}); err != nil || n != 1 {
 		t.Fatalf("vote rows=%d error=%v", n, err)
 	}
 	roots, err := queries.ListRootPosts(ctx, sqlc.ListRootPostsParams{
-		ViewerID: "plumber",
-		RowLimit: 100,
-		PostDate: "2026-08-26",
+		ViewerID:    "plumber",
+		RowLimit:    100,
+		PostDate:    "2026-08-26",
+		HiddenState: string(PostStateHidden),
 	})
 	if err != nil {
 		t.Fatal(err)
@@ -273,7 +281,7 @@ INSERT INTO posts (
 DROP INDEX idx_posts_root_date;
 ALTER TABLE posts RENAME COLUMN post_date TO hunt_date;
 CREATE INDEX idx_posts_root_hunt
-  ON posts(hunt_date, hidden)
+  ON posts(hunt_date, post_state)
   WHERE parent_id IS NULL;`); err != nil {
 		t.Fatal(err)
 	}
@@ -322,6 +330,84 @@ SELECT post_date FROM posts WHERE id = 'question-1'`).Scan(&migratedPostDate); e
 			migratedPostDate,
 		)
 	}
+
+	if _, err := conn.ExecContext(ctx, `
+DROP INDEX idx_posts_root_date;
+ALTER TABLE posts DROP CONSTRAINT posts_shape_check;
+ALTER TABLE posts ADD COLUMN hidden INTEGER NOT NULL DEFAULT 0;
+UPDATE posts SET hidden = CASE WHEN id = 'question-1' THEN 1 ELSE 0 END;
+ALTER TABLE posts DROP COLUMN post_state;
+ALTER TABLE posts ADD CONSTRAINT posts_check 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)
+);
+CREATE INDEX idx_posts_root_date
+  ON posts(post_date, hidden)
+  WHERE parent_id IS NULL;`); err != nil {
+		t.Fatal(err)
+	}
+	if err := migratePostState(ctx, conn); err != nil {
+		t.Fatal(err)
+	}
+	if err := migratePostState(ctx, conn); err != nil {
+		t.Fatalf("post state migration is not idempotent: %v", err)
+	}
+
+	var postStateColumnCount, hiddenColumnCount int
+	if err := conn.QueryRowContext(ctx, `
+SELECT
+  count(*) FILTER (WHERE column_name = 'post_state'),
+  count(*) FILTER (WHERE column_name = 'hidden')
+FROM information_schema.columns
+WHERE table_schema = current_schema()
+  AND table_name = 'posts'`).Scan(&postStateColumnCount, &hiddenColumnCount); err != nil {
+		t.Fatal(err)
+	}
+	var hiddenState, replyStateAfterMigration string
+	if err := conn.QueryRowContext(ctx, `
+SELECT post_state FROM posts WHERE id = 'question-1'`).Scan(&hiddenState); err != nil {
+		t.Fatal(err)
+	}
+	if err := conn.QueryRowContext(ctx, `
+SELECT post_state FROM posts WHERE id = 'answer:question-1'`).Scan(&replyStateAfterMigration); err != nil {
+		t.Fatal(err)
+	}
+	var postStateDataType string
+	if err := conn.QueryRowContext(ctx, `
+SELECT data_type
+FROM information_schema.columns
+WHERE table_schema = current_schema()
+  AND table_name = 'posts'
+  AND column_name = 'post_state'`).Scan(&postStateDataType); err != nil {
+		t.Fatal(err)
+	}
+	var stateIndexCount int
+	if err := conn.QueryRowContext(ctx, `
+SELECT count(*)
+FROM pg_indexes
+WHERE schemaname = current_schema()
+  AND tablename = 'posts'
+  AND indexname = 'idx_posts_root_date'
+  AND indexdef LIKE '%(post_date, post_state)%'`).Scan(&stateIndexCount); err != nil {
+		t.Fatal(err)
+	}
+	if postStateColumnCount != 1 ||
+		hiddenColumnCount != 0 ||
+		hiddenState != "hidden" ||
+		replyStateAfterMigration != "visible" ||
+		postStateDataType != "text" ||
+		stateIndexCount != 1 {
+		t.Fatalf(
+			"post state migration columns=%d hidden_columns=%d root=%q reply=%q type=%q indexes=%d",
+			postStateColumnCount,
+			hiddenColumnCount,
+			hiddenState,
+			replyStateAfterMigration,
+			postStateDataType,
+			stateIndexCount,
+		)
+	}
 }
 
 func TestMigratePostsReportsStep(t *testing.T) {

internal/store/post.go

@@ -21,6 +21,14 @@ var (
 	ErrPostNotVotable = errors.New("post not votable")
 )
 
+type PostState string
+
+const (
+	PostStateVisible PostState = "visible"
+	PostStateHidden  PostState = "hidden"
+	PostStateLocked  PostState = "locked"
+)
+
 // Post is either a root question (ParentID nil) or a reply to another post.
 type Post struct {
 	ID         string
@@ -32,7 +40,7 @@ type Post struct {
 	Body       string
 	City       string
 	PostDate   string
-	Hidden     bool
+	PostState  PostState
 	CreatedAt  string
 	UpdatedAt  string
 	Score      int
@@ -63,7 +71,7 @@ func (p *Post) Create(ctx context.Context) error {
 		Body:      p.Body,
 		City:      p.City,
 		PostDate:  p.PostDate,
-		Hidden:    boolInt32(p.Hidden),
+		PostState: string(p.PostState),
 		CreatedAt: p.CreatedAt,
 		UpdatedAt: p.UpdatedAt,
 	})
@@ -101,6 +109,14 @@ func preparePost(p *Post) error {
 	p.Body = strings.TrimSpace(p.Body)
 	p.City = strings.TrimSpace(p.City)
 	p.PostDate = strings.TrimSpace(p.PostDate)
+	if p.PostState == "" {
+		p.PostState = PostStateVisible
+	}
+	switch p.PostState {
+	case PostStateVisible, PostStateHidden, PostStateLocked:
+	default:
+		return fmt.Errorf("%w: invalid post state", ErrInvalidPost)
+	}
 	if p.AuthorID == "" {
 		return fmt.Errorf("%w: author is required", ErrInvalidPost)
 	}
@@ -120,7 +136,7 @@ func preparePost(p *Post) error {
 			return fmt.Errorf("%w: parent is required", ErrInvalidPost)
 		}
 		p.ParentID = &parentID
-		if p.Title != "" || p.City != "" || p.PostDate != "" || p.Hidden {
+		if p.Title != "" || p.City != "" || p.PostDate != "" || p.PostState != PostStateVisible {
 			return fmt.Errorf("%w: reply contains root-only fields", ErrInvalidPost)
 		}
 	}
@@ -152,13 +168,6 @@ func parentIDFromNull(parentID sql.NullString) *string {
 	return &id
 }
 
-func boolInt32(value bool) int32 {
-	if value {
-		return 1
-	}
-	return 0
-}
-
 func mapPostCreateError(err error) error {
 	if err == nil {
 		return nil
@@ -178,7 +187,7 @@ func postFromValues(
 	id string,
 	parentID sql.NullString,
 	authorID, authorName, authorRole, title, body, city, postDate string,
-	hidden int32,
+	postState string,
 	createdAt, updatedAt string,
 ) Post {
 	return Post{
@@ -191,7 +200,7 @@ func postFromValues(
 		Body:       body,
 		City:       city,
 		PostDate:   postDate,
-		Hidden:     hidden != 0,
+		PostState:  PostState(postState),
 		CreatedAt:  createdAt,
 		UpdatedAt:  updatedAt,
 		db:         db,
@@ -215,7 +224,7 @@ func GetPost(ctx context.Context, db *sql.DB, id string) (*Post, error) {
 		r.Body,
 		r.City,
 		r.PostDate,
-		r.Hidden,
+		r.PostState,
 		r.CreatedAt,
 		r.UpdatedAt,
 	)
@@ -241,7 +250,7 @@ func GetPostThread(ctx context.Context, db *sql.DB, rootID string) (*Post, error
 			r.Body,
 			r.City,
 			r.PostDate,
-			r.Hidden,
+			r.PostState,
 			r.CreatedAt,
 			r.UpdatedAt,
 		))
@@ -292,9 +301,10 @@ func buildPostTree(posts []Post, rootID string) (*Post, error) {
 // ListRootPosts returns visible root posts for a post date.
 func ListRootPosts(ctx context.Context, db *sql.DB, postDate, viewerID string) ([]Post, error) {
 	rows, err := sqlc.New(db).ListRootPosts(ctx, sqlc.ListRootPostsParams{
-		ViewerID: viewerID,
-		RowLimit: HuntListLimit,
-		PostDate: postDate,
+		ViewerID:    viewerID,
+		RowLimit:    HuntListLimit,
+		PostDate:    postDate,
+		HiddenState: string(PostStateHidden),
 	})
 	if err != nil {
 		return nil, err
@@ -312,7 +322,7 @@ func ListRootPosts(ctx context.Context, db *sql.DB, postDate, viewerID string) (
 			r.Body,
 			r.City,
 			r.PostDate,
-			r.Hidden,
+			r.PostState,
 			r.CreatedAt,
 			r.UpdatedAt,
 		)
@@ -331,7 +341,10 @@ func SetPostVote(ctx context.Context, db *sql.DB, userID, postID string, value i
 	}
 	q := sqlc.New(db)
 	if value == 0 {
-		visible, err := q.PostIsVisibleRoot(ctx, postID)
+		visible, err := q.PostIsVisibleRoot(ctx, sqlc.PostIsVisibleRootParams{
+			ID:          postID,
+			HiddenState: string(PostStateHidden),
+		})
 		if err != nil {
 			return err
 		}
@@ -344,9 +357,10 @@ func SetPostVote(ctx context.Context, db *sql.DB, userID, postID string, value i
 		})
 	}
 	n, err := q.UpsertPostVoteOnVisibleRoot(ctx, sqlc.UpsertPostVoteOnVisibleRootParams{
-		UserID: userID,
-		PostID: postID,
-		Value:  int32(value),
+		UserID:      userID,
+		PostID:      postID,
+		Value:       int32(value),
+		HiddenState: string(PostStateHidden),
 	})
 	if err != nil {
 		return err

internal/store/post_test.go

@@ -50,6 +50,9 @@ func TestMemoryPostLifecycle(t *testing.T) {
 	if err := mem.CreatePost(ctx, root); err != nil {
 		t.Fatal(err)
 	}
+	if root.PostState != PostStateVisible {
+		t.Fatalf("default post state = %q, want visible", root.PostState)
+	}
 
 	rootID := root.ID
 	later := &Post{
@@ -175,6 +178,24 @@ func TestMemoryPostValidation(t *testing.T) {
 				Body:     "Body",
 			},
 		},
+		{
+			name: "invalid post state",
+			post: &Post{
+				AuthorID:  homeowner.ID,
+				Title:     "Invalid state",
+				Body:      "Body",
+				PostState: PostState("archived"),
+			},
+		},
+		{
+			name: "reply with non-visible state",
+			post: &Post{
+				ParentID:  ptr("missing"),
+				AuthorID:  homeowner.ID,
+				Body:      "Body",
+				PostState: PostStateLocked,
+			},
+		},
 	}
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
@@ -185,12 +206,12 @@ func TestMemoryPostValidation(t *testing.T) {
 	}
 
 	hidden := &Post{
-		ID:       "hidden",
-		AuthorID: homeowner.ID,
-		Title:    "Hidden",
-		Body:     "Body",
-		PostDate: "2026-08-26",
-		Hidden:   true,
+		ID:        "hidden",
+		AuthorID:  homeowner.ID,
+		Title:     "Hidden",
+		Body:      "Body",
+		PostDate:  "2026-08-26",
+		PostState: PostStateHidden,
 	}
 	if err := mem.CreatePost(ctx, hidden); err != nil {
 		t.Fatal(err)
@@ -199,6 +220,28 @@ func TestMemoryPostValidation(t *testing.T) {
 		t.Fatalf("hidden root vote error = %v", err)
 	}
 
+	locked := &Post{
+		ID:        "locked",
+		AuthorID:  homeowner.ID,
+		Title:     "Locked",
+		Body:      "Body",
+		PostDate:  "2026-08-26",
+		PostState: PostStateLocked,
+	}
+	if err := mem.CreatePost(ctx, locked); err != nil {
+		t.Fatal(err)
+	}
+	if err := mem.VotePost(ctx, homeowner.ID, locked.ID, 1); err != nil {
+		t.Fatalf("locked root should remain votable: %v", err)
+	}
+	roots, err := mem.ListRootPosts(ctx, locked.PostDate, homeowner.ID)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(roots) != 1 || roots[0].ID != locked.ID || roots[0].PostState != PostStateLocked {
+		t.Fatalf("locked root should remain visible: %+v", roots)
+	}
+
 	if _, err := mem.GetPostThread(ctx, "missing"); !errors.Is(err, sql.ErrNoRows) {
 		t.Fatalf("missing thread error = %v", err)
 	}

internal/store/sqlc/models.go

@@ -25,7 +25,7 @@ type Post struct {
 	Body      string
 	City      string
 	PostDate  string
-	Hidden    int32
+	PostState string
 	CreatedAt string
 	UpdatedAt string
 }

internal/store/sqlc/posts.sql.go

@@ -12,7 +12,7 @@ import (
 
 const createPost = `-- name: CreatePost :exec
 INSERT INTO posts (
-  id, parent_id, author_id, title, body, city, post_date, hidden, created_at, updated_at
+  id, parent_id, author_id, title, body, city, post_date, post_state, created_at, updated_at
 )
 VALUES (
   $1,
@@ -36,7 +36,7 @@ type CreatePostParams struct {
 	Body      string
 	City      string
 	PostDate  string
-	Hidden    int32
+	PostState string
 	CreatedAt string
 	UpdatedAt string
 }
@@ -50,7 +50,7 @@ func (q *Queries) CreatePost(ctx context.Context, arg CreatePostParams) error {
 		arg.Body,
 		arg.City,
 		arg.PostDate,
-		arg.Hidden,
+		arg.PostState,
 		arg.CreatedAt,
 		arg.UpdatedAt,
 	)
@@ -76,7 +76,7 @@ func (q *Queries) DeletePostVote(ctx context.Context, arg DeletePostVoteParams)
 const getPost = `-- name: GetPost :one
 SELECT
   p.id, p.parent_id, p.author_id, u.name AS author_name, u.role AS author_role,
-  p.title, p.body, p.city, p.post_date, p.hidden, p.created_at, p.updated_at
+  p.title, p.body, p.city, p.post_date, p.post_state, p.created_at, p.updated_at
 FROM posts p
 JOIN users u ON u.id = p.author_id
 WHERE p.id = $1
@@ -92,7 +92,7 @@ type GetPostRow struct {
 	Body       string
 	City       string
 	PostDate   string
-	Hidden     int32
+	PostState  string
 	CreatedAt  string
 	UpdatedAt  string
 }
@@ -110,7 +110,7 @@ func (q *Queries) GetPost(ctx context.Context, id string) (GetPostRow, error) {
 		&i.Body,
 		&i.City,
 		&i.PostDate,
-		&i.Hidden,
+		&i.PostState,
 		&i.CreatedAt,
 		&i.UpdatedAt,
 	)
@@ -119,13 +119,13 @@ func (q *Queries) GetPost(ctx context.Context, id string) (GetPostRow, error) {
 
 const listPostThread = `-- name: ListPostThread :many
 WITH RECURSIVE thread AS (
-  SELECT p.id, p.parent_id, p.author_id, p.title, p.body, p.city, p.post_date, p.hidden, p.created_at, p.updated_at
+  SELECT p.id, p.parent_id, p.author_id, p.title, p.body, p.city, p.post_date, p.post_state, p.created_at, p.updated_at
   FROM posts p
   WHERE p.id = $1 AND p.parent_id IS NULL
 
   UNION ALL
 
-  SELECT child.id, child.parent_id, child.author_id, child.title, child.body, child.city, child.post_date, child.hidden, child.created_at, child.updated_at
+  SELECT child.id, child.parent_id, child.author_id, child.title, child.body, child.city, child.post_date, child.post_state, child.created_at, child.updated_at
   FROM posts child
   JOIN thread parent ON child.parent_id = parent.id
 )
@@ -133,7 +133,7 @@ SELECT
   thread.id, thread.parent_id, thread.author_id,
   u.name AS author_name, u.role AS author_role,
   thread.title, thread.body, thread.city, thread.post_date,
-  thread.hidden, thread.created_at, thread.updated_at
+  thread.post_state, thread.created_at, thread.updated_at
 FROM thread
 JOIN users u ON u.id = thread.author_id
 ORDER BY thread.created_at, thread.id
@@ -149,7 +149,7 @@ type ListPostThreadRow struct {
 	Body       string
 	City       string
 	PostDate   string
-	Hidden     int32
+	PostState  string
 	CreatedAt  string
 	UpdatedAt  string
 }
@@ -173,7 +173,7 @@ func (q *Queries) ListPostThread(ctx context.Context, rootID string) ([]ListPost
 			&i.Body,
 			&i.City,
 			&i.PostDate,
-			&i.Hidden,
+			&i.PostState,
 			&i.CreatedAt,
 			&i.UpdatedAt,
 		); err != nil {
@@ -192,11 +192,11 @@ func (q *Queries) ListPostThread(ctx context.Context, rootID string) ([]ListPost
 
 const listRootPosts = `-- name: ListRootPosts :many
 WITH RECURSIVE roots AS (
-  SELECT p.id, p.parent_id, p.author_id, p.title, p.body, p.city, p.post_date, p.hidden, p.created_at, p.updated_at
+  SELECT p.id, p.parent_id, p.author_id, p.title, p.body, p.city, p.post_date, p.post_state, p.created_at, p.updated_at
   FROM posts p
   WHERE p.parent_id IS NULL
     AND p.post_date = $3
-    AND p.hidden = 0
+    AND p.post_state <> $4
 ),
 thread AS (
   SELECT roots.id AS root_id, child.id AS post_id, child.author_id
@@ -225,7 +225,7 @@ SELECT
   roots.id, roots.parent_id, roots.author_id,
   u.name AS author_name, u.role AS author_role,
   roots.title, roots.body, roots.city, roots.post_date,
-  roots.hidden, roots.created_at, roots.updated_at,
+  roots.post_state, roots.created_at, roots.updated_at,
   COALESCE(scores.score, 0)::bigint AS score,
   (answered.root_id IS NOT NULL)::bool AS answered,
   COALESCE(viewer_vote.value, 0)::bigint AS user_vote
@@ -241,9 +241,10 @@ LIMIT $2
 `
 
 type ListRootPostsParams struct {
-	ViewerID string
-	RowLimit int32
-	PostDate string
+	ViewerID    string
+	RowLimit    int32
+	PostDate    string
+	HiddenState string
 }
 
 type ListRootPostsRow struct {
@@ -256,7 +257,7 @@ type ListRootPostsRow struct {
 	Body       string
 	City       string
 	PostDate   string
-	Hidden     int32
+	PostState  string
 	CreatedAt  string
 	UpdatedAt  string
 	Score      int64
@@ -265,7 +266,12 @@ type ListRootPostsRow struct {
 }
 
 func (q *Queries) ListRootPosts(ctx context.Context, arg ListRootPostsParams) ([]ListRootPostsRow, error) {
-	rows, err := q.db.QueryContext(ctx, listRootPosts, arg.ViewerID, arg.RowLimit, arg.PostDate)
+	rows, err := q.db.QueryContext(ctx, listRootPosts,
+		arg.ViewerID,
+		arg.RowLimit,
+		arg.PostDate,
+		arg.HiddenState,
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -283,7 +289,7 @@ func (q *Queries) ListRootPosts(ctx context.Context, arg ListRootPostsParams) ([
 			&i.Body,
 			&i.City,
 			&i.PostDate,
-			&i.Hidden,
+			&i.PostState,
 			&i.CreatedAt,
 			&i.UpdatedAt,
 			&i.Score,
@@ -307,12 +313,19 @@ const postIsVisibleRoot = `-- name: PostIsVisibleRoot :one
 SELECT EXISTS(
   SELECT 1
   FROM posts
-  WHERE id = $1 AND parent_id IS NULL AND hidden = 0
+  WHERE id = $1
+    AND parent_id IS NULL
+    AND post_state <> $2
 )::bool
 `
 
-func (q *Queries) PostIsVisibleRoot(ctx context.Context, id string) (bool, error) {
-	row := q.db.QueryRowContext(ctx, postIsVisibleRoot, id)
+type PostIsVisibleRootParams struct {
+	ID          string
+	HiddenState string
+}
+
+func (q *Queries) PostIsVisibleRoot(ctx context.Context, arg PostIsVisibleRootParams) (bool, error) {
+	row := q.db.QueryRowContext(ctx, postIsVisibleRoot, arg.ID, arg.HiddenState)
 	var column_1 bool
 	err := row.Scan(&column_1)
 	return column_1, err
@@ -346,19 +359,25 @@ SELECT $1, $2, $3
 FROM posts p
 WHERE p.id = $2
   AND p.parent_id IS NULL
-  AND p.hidden = 0
+  AND p.post_state <> $4
 ON CONFLICT (user_id, post_id) DO UPDATE
 SET value = excluded.value
 `
 
 type UpsertPostVoteOnVisibleRootParams struct {
-	UserID string
-	PostID string
-	Value  int32
+	UserID      string
+	PostID      string
+	Value       int32
+	HiddenState string
 }
 
 func (q *Queries) UpsertPostVoteOnVisibleRoot(ctx context.Context, arg UpsertPostVoteOnVisibleRootParams) (int64, error) {
-	result, err := q.db.ExecContext(ctx, upsertPostVoteOnVisibleRoot, arg.UserID, arg.PostID, arg.Value)
+	result, err := q.db.ExecContext(ctx, upsertPostVoteOnVisibleRoot,
+		arg.UserID,
+		arg.PostID,
+		arg.Value,
+		arg.HiddenState,
+	)
 	if err != nil {
 		return 0, err
 	}

schema.sql

@@ -50,13 +50,13 @@ CREATE TABLE IF NOT EXISTS posts (
   body TEXT NOT NULL,
   city TEXT NOT NULL DEFAULT '',
   post_date TEXT NOT NULL DEFAULT '',
-  hidden INTEGER NOT NULL DEFAULT 0,
+  post_state TEXT NOT NULL,
   created_at TEXT NOT NULL,
   updated_at TEXT NOT NULL,
-  CHECK (
+  CONSTRAINT posts_shape_check 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)
+    (parent_id IS NOT NULL AND title = '' AND city = '' AND post_date = '')
   )
 );
 
@@ -64,7 +64,7 @@ CREATE INDEX IF NOT EXISTS idx_posts_parent_created
   ON posts(parent_id, created_at, id);
 
 CREATE INDEX IF NOT EXISTS idx_posts_root_date
-  ON posts(post_date, hidden)
+  ON posts(post_date, post_state)
   WHERE parent_id IS NULL;
 
 CREATE TABLE IF NOT EXISTS post_votes (