fix: chat accepts posts

internal/repository/chat_repo.go

@@ -547,6 +547,12 @@ type AddAttachmentParams struct {
 	Description *string
 	SiteName    *string
 	ImageURL    *string
+
+	// Shared entity: the durable reference plus a snapshot used only as a
+	// fallback. Live data is re-resolved per viewer at read time.
+	EntityType *string
+	EntityID   *string
+	Snapshot   []byte
 }
 
 // AddAttachment persists one attachment. conversation_id is denormalized here
@@ -557,17 +563,20 @@ func (r *ChatRepo) AddAttachment(ctx context.Context, p AddAttachmentParams) (*m
 		INSERT INTO message_attachments
 		    (message_id, conversation_id, ord, kind, r2_key, mime, size_bytes,
 		     width, height, duration_ms, blurhash, file_name,
-		     url, title, description, site_name, image_url)
-		VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,$16,$17)
+		     url, title, description, site_name, image_url,
+		     entity_type, entity_id, snapshot)
+		VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,$16,$17,$18,$19,$20)
 		RETURNING id, message_id, ord, kind, mime, size_bytes, width, height,
 		          duration_ms, blurhash, file_name, url, title, description,
-		          site_name, image_url, created_at`,
+		          site_name, image_url, entity_type, entity_id, snapshot, created_at`,
 		p.MessageID, p.ConversationID, p.Ord, p.Kind, p.R2Key, p.Mime, p.SizeBytes,
 		p.Width, p.Height, p.DurationMs, p.Blurhash, p.FileName,
 		p.URL, p.Title, p.Description, p.SiteName, p.ImageURL,
+		p.EntityType, p.EntityID, p.Snapshot,
 	).Scan(&a.ID, &a.MessageID, &a.Ord, &a.Kind, &a.Mime, &a.SizeBytes, &a.Width,
 		&a.Height, &a.DurationMs, &a.Blurhash, &a.FileName, &a.URL, &a.Title,
-		&a.Description, &a.SiteName, &a.ImageURL, &a.CreatedAt)
+		&a.Description, &a.SiteName, &a.ImageURL,
+		&a.EntityType, &a.EntityID, &a.Entity, &a.CreatedAt)
 	if err != nil {
 		return nil, fmt.Errorf("add attachment: %w", err)
 	}
@@ -583,7 +592,7 @@ func (r *ChatRepo) AttachmentsFor(ctx context.Context, messageIDs []string) (map
 	rows, err := r.pg.Pool.Query(ctx, `
 		SELECT id, message_id, ord, kind, mime, size_bytes, width, height,
 		       duration_ms, blurhash, file_name, url, title, description,
-		       site_name, image_url, created_at
+		       site_name, image_url, entity_type, entity_id, snapshot, created_at
 		FROM message_attachments
 		WHERE message_id = ANY($1)
 		ORDER BY message_id, ord`, messageIDs)
@@ -595,7 +604,8 @@ func (r *ChatRepo) AttachmentsFor(ctx context.Context, messageIDs []string) (map
 		var a model.Attachment
 		if err := rows.Scan(&a.ID, &a.MessageID, &a.Ord, &a.Kind, &a.Mime, &a.SizeBytes,
 			&a.Width, &a.Height, &a.DurationMs, &a.Blurhash, &a.FileName, &a.URL,
-			&a.Title, &a.Description, &a.SiteName, &a.ImageURL, &a.CreatedAt); err != nil {
+			&a.Title, &a.Description, &a.SiteName, &a.ImageURL,
+			&a.EntityType, &a.EntityID, &a.Entity, &a.CreatedAt); err != nil {
 			return nil, fmt.Errorf("scan attachment: %w", err)
 		}
 		out[a.MessageID] = append(out[a.MessageID], a)
@@ -640,7 +650,8 @@ func (r *ChatRepo) Gallery(ctx context.Context, conversationID, userID string, k
 	rows, err := r.pg.Pool.Query(ctx, `
 		SELECT a.id, a.message_id, a.ord, a.kind, a.mime, a.size_bytes, a.width,
 		       a.height, a.duration_ms, a.blurhash, a.file_name, a.url, a.title,
-		       a.description, a.site_name, a.image_url, a.created_at
+		       a.description, a.site_name, a.image_url,
+		       a.entity_type, a.entity_id, a.snapshot, a.created_at
 		FROM message_attachments a
 		JOIN messages m ON m.id = a.message_id
 		WHERE a.conversation_id = $1
@@ -661,7 +672,8 @@ func (r *ChatRepo) Gallery(ctx context.Context, conversationID, userID string, k
 		var a model.Attachment
 		if err := rows.Scan(&a.ID, &a.MessageID, &a.Ord, &a.Kind, &a.Mime, &a.SizeBytes,
 			&a.Width, &a.Height, &a.DurationMs, &a.Blurhash, &a.FileName, &a.URL,
-			&a.Title, &a.Description, &a.SiteName, &a.ImageURL, &a.CreatedAt); err != nil {
+			&a.Title, &a.Description, &a.SiteName, &a.ImageURL,
+			&a.EntityType, &a.EntityID, &a.Entity, &a.CreatedAt); err != nil {
 			return nil, fmt.Errorf("scan gallery row: %w", err)
 		}
 		out = append(out, a)

internal/repository/post_repo.go

@@ -160,6 +160,46 @@ func (r *PostRepo) FindByID(ctx context.Context, id string) (*model.Post, error)
 	return p, nil
 }
 
+// FindByIDs loads many posts at once, keyed by id. Missing and soft-deleted
+// ids are simply absent from the map.
+//
+// Exists so a page of chat messages sharing N posts costs one query instead of
+// N — the same reason ImagesFor is batched.
+func (r *PostRepo) FindByIDs(ctx context.Context, ids []string) (map[string]*model.Post, error) {
+	out := make(map[string]*model.Post, len(ids))
+	if len(ids) == 0 {
+		return out, nil
+	}
+	q := `SELECT ` + postSelectColumns + postSelectFrom + `WHERE p.id = ANY($1) AND p.deleted_at IS NULL`
+	rows, err := r.pg.Pool.Query(ctx, q, ids)
+	if err != nil {
+		return nil, fmt.Errorf("find posts: %w", err)
+	}
+	defer rows.Close()
+
+	found := make([]string, 0, len(ids))
+	for rows.Next() {
+		p := &model.Post{}
+		if err := scanPost(rows, p); err != nil {
+			return nil, fmt.Errorf("scan post: %w", err)
+		}
+		out[p.ID] = p
+		found = append(found, p.ID)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, fmt.Errorf("find posts: %w", err)
+	}
+
+	imgs, err := r.ImagesFor(ctx, found)
+	if err != nil {
+		return nil, err
+	}
+	for id, p := range out {
+		p.Images = imgs[id]
+	}
+	return out, nil
+}
+
 // ListByHandle returns the profile feed for a user. Unknown handle →
 // empty page (matches pre-existing behaviour).
 func (r *PostRepo) ListByHandle(ctx context.Context, handle string, limit, offset int) ([]model.Post, int, error) {

internal/repository/social_graph_repo.go

@@ -242,6 +242,35 @@ func (r *BlockRepo) Unblock(ctx context.Context, blockerID, blockedID string) er
 
 // BlockState reports, in one round-trip, whether a blocked b and whether
 // b blocked a.
+// BlockedWith returns the subset of others that viewerID is blocked with in
+// EITHER direction — the set whose content must be hidden from them.
+//
+// The batched counterpart to BlockState, for resolving many authors at once.
+func (r *BlockRepo) BlockedWith(ctx context.Context, viewerID string, others []string) (map[string]bool, error) {
+	out := make(map[string]bool, len(others))
+	if viewerID == "" || len(others) == 0 {
+		return out, nil
+	}
+	rows, err := r.pg.Pool.Query(ctx, `
+		SELECT CASE WHEN blocker_id = $1 THEN blocked_id ELSE blocker_id END
+		FROM user_blocks
+		WHERE (blocker_id = $1 AND blocked_id = ANY($2))
+		   OR (blocked_id = $1 AND blocker_id = ANY($2))`,
+		viewerID, others)
+	if err != nil {
+		return nil, fmt.Errorf("blocked with: %w", err)
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var id string
+		if err := rows.Scan(&id); err != nil {
+			return nil, fmt.Errorf("scan blocked with: %w", err)
+		}
+		out[id] = true
+	}
+	return out, rows.Err()
+}
+
 func (r *BlockRepo) BlockState(ctx context.Context, a, b string) (aBlockedB, bBlockedA bool, err error) {
 	err = r.pg.Pool.QueryRow(ctx, `
 		SELECT