feat(api): enhance community retrieval with flexible ID handling

Updated the GetCommunity function to accept both UUIDs and community titles for improved flexibility in community retrieval. Added error handling for invalid ID formats and adjusted related functions to ensure consistent behavior across memory and PostgreSQL storage. This change enhances the API's usability by allowing more intuitive community lookups.

internal/repository/postgres.go

@@ -1237,12 +1237,32 @@ func (p *Postgres) ListCommunities(tenantID string) ([]*store.Community, error)
 	return out, nil
 }
 
-func (p *Postgres) GetCommunity(tenantID, id string) (*store.Community, error) {
+func (p *Postgres) GetCommunity(tenantID, idOrKey string) (*store.Community, error) {
 	ctx := context.Background()
+	key := strings.TrimSpace(idOrKey)
+	if key == "" {
+		return nil, store.ErrNotFound
+	}
 	var c store.Community
 	c.TenantID = tenantID
-	err := p.pool.QueryRow(ctx, `SELECT id::text, community, title, value_json::text FROM bgp_community WHERE id=$1 AND tenant_id=$2`, id, tenantID).Scan(
-		&c.ID, &c.Community, &c.Title, &c.ValueJSON)
+	// Prefer UUID id; fall back to community / title so clients that store the
+	// autocomplete label (Base UI {value,label} → label) still resolve.
+	var err error
+	if _, perr := uuid.Parse(key); perr == nil {
+		err = p.pool.QueryRow(ctx, `SELECT id::text, community, title, value_json::text FROM bgp_community WHERE id=$1 AND tenant_id=$2`, key, tenantID).Scan(
+			&c.ID, &c.Community, &c.Title, &c.ValueJSON)
+	} else {
+		err = p.pool.QueryRow(ctx, `
+			SELECT id::text, community, title, value_json::text FROM bgp_community
+			WHERE tenant_id=$1 AND (
+				community = $2
+				OR title = $2
+				OR (NULLIF(trim(title), '') IS NOT NULL AND (community || ' · ' || title) = $2)
+			)
+			ORDER BY community
+			LIMIT 1`, tenantID, key).Scan(
+			&c.ID, &c.Community, &c.Title, &c.ValueJSON)
+	}
 	if err != nil {
 		if errors.Is(err, pgx.ErrNoRows) {
 			return nil, store.ErrNotFound
@@ -1253,9 +1273,11 @@ func (p *Postgres) GetCommunity(tenantID, id string) (*store.Community, error) {
 }
 
 func (p *Postgres) ListCommunityPrefixes(tenantID, communityID, cursor string, limit int) ([]store.PrefixRow, string, bool, error) {
-	if _, err := p.GetCommunity(tenantID, communityID); err != nil {
+	comm, err := p.GetCommunity(tenantID, communityID)
+	if err != nil {
 		return nil, "", false, err
 	}
+	resolvedID := comm.ID
 	if limit <= 0 {
 		limit = 500
 	}
@@ -1271,7 +1293,6 @@ func (p *Postgres) ListCommunityPrefixes(tenantID, communityID, cursor string, l
 	ctx := context.Background()
 	useSnap := prefixSnapshotTableExists(ctx, p.pool)
 	var rows pgx.Rows
-	var err error
 	if useSnap {
 		rows, err = p.pool.Query(ctx, `
 			WITH latest AS (
@@ -1293,7 +1314,7 @@ func (p *Postgres) ListCommunityPrefixes(tenantID, communityID, cursor string, l
 			)
 			SELECT prefix, source FROM combined
 			ORDER BY prefix
-			LIMIT $3 OFFSET $4`, tenantID, communityID, limit+1, off)
+			LIMIT $3 OFFSET $4`, tenantID, resolvedID, limit+1, off)
 	} else {
 		rows, err = p.pool.Query(ctx, `
 			WITH latest AS (
@@ -1307,20 +1328,19 @@ func (p *Postgres) ListCommunityPrefixes(tenantID, communityID, cursor string, l
 			JOIN latest l ON l.id = rmp.revision_id
 			WHERE rmp.community_id = $2::uuid
 			ORDER BY 1
-			LIMIT $3 OFFSET $4`, tenantID, communityID, limit+1, off)
+			LIMIT $3 OFFSET $4`, tenantID, resolvedID, limit+1, off)
 	}
 	if err != nil {
 		return nil, "", false, err
 	}
 	defer rows.Close()
 	var all []store.PrefixRow
-	comm := communityID
 	for rows.Next() {
 		var pr store.PrefixRow
 		if err := rows.Scan(&pr.Prefix, &pr.Source); err != nil {
 			continue
 		}
-		pr.CommunityID = &comm
+		pr.CommunityID = &resolvedID
 		all = append(all, pr)
 	}
 	more := len(all) > limit