proto rename for migrating profile to a new year

common/proto/accounting.proto

@@ -433,16 +433,18 @@ message OpeningBalanceAccountMapping {
   string created_by_user_id = 14;
 }
 
-// A predecessor account still holding value that no mapping carries into the
-// target period. Closing the target period drops these balances silently, so
-// each one is either an account left to map or one deliberately closed out.
-message UnmappedSourceAccount {
+// A portion of a predecessor account's value that no mapping carries into the
+// target period. Closing the target period drops this value, so each entry must
+// either be covered by a broader mapping or deliberately closed out.
+message UnmappedSourceBalance {
   int64 source_period_id = 1;
   string source_profile_name = 2;
   repeated string source_account_segments = 3;
   string currency = 4;
-  // Signed balance uses the debit-positive convention, and is never zero.
-  string closing_balance = 5;
+  // Signed portion not covered by a mapping, using the debit-positive
+  // convention. This is never zero and may be less than the account's
+  // aggregate closing balance when descendants are mapped separately.
+  string unmapped_balance = 5;
   OpeningBalanceStatus status = 6;
 }
 
@@ -453,5 +455,5 @@ message ListOpeningBalanceAccountsResponse {
   // account path. Populated once the period carries balances by explicit
   // mapping only, which happens when the predecessor belongs to another
   // profile or when the period has at least one mapping of its own.
-  repeated UnmappedSourceAccount unmapped_source_accounts = 2;
+  repeated UnmappedSourceBalance unmapped_source_balances = 2;
 }