currency per column in table definition

common/proto/analytics.proto

@@ -30,7 +30,6 @@ message AnalyticsTable {
   string name = 2;
   repeated AnalyticsCatalogColumn columns = 3;
   repeated AnalyticsTableLink links = 4;
-  string base_currency = 5;
 }
 
 message AnalyticsCatalogColumn {
@@ -39,6 +38,8 @@ message AnalyticsCatalogColumn {
   string field_type = 2;
   bool is_system = 3;
   string rounding = 4;
+  // Canonical ISO-4217 code for MONEY; empty for every other type.
+  string currency = 5;
 }
 
 message AnalyticsTableLink {

common/proto/table_definition.proto

@@ -83,9 +83,6 @@ message PostTableDefinitionRequest {
   // like "public", "information_schema", or ones starting with "pg_".
   string profile_name = 5;
 
-  // ISO-4217 base currency used by every MONEY column in this table.
-  string base_currency = 6;
-
   // Columns whose values identify a row to users in pickers, in the order
   // they are shown. Each must name one of the user-defined columns above.
   // Empty means the row is identified by its id alone.
@@ -94,7 +91,7 @@ message PostTableDefinitionRequest {
   // ISO-4217 currency the profile keeps its accounting in. A profile is one
   // accounting entity and keeps one set of books, so this is required only when
   // the request creates the profile, and is ignored afterwards. It is unrelated
-  // to base_currency: tables may hold money in any currency, and amounts convert
+  // to individual MONEY-column currencies: tables may hold money in any currency, and amounts convert
   // to this one when they reach the ledger.
   string accounting_currency = 8;
 }
@@ -116,7 +113,6 @@ message CreateInvoiceTemplateTableRequest {
   string profile_name = 1;
   string table_name = 2;
   string typst_source = 3;
-  string base_currency = 4;
   repeated string row_display_columns = 5;
 }
 
@@ -150,9 +146,6 @@ message AddTableColumnsRequest {
   // Optional indexes for the new columns only.
   repeated string indexes = 4;
 
-  // Required when adding the first MONEY column to a table.
-  string base_currency = 5;
-
 }
 
 enum MoneyRounding {
@@ -176,7 +169,7 @@ message ColumnDefinition {
   //   RAW_DATETIME (timezone-free civil datetime)
   //   PHONE (international or national phone number; generates extension/type/country/calling-code companions)
   //   TIME (timezone-free time of day)
-  //   MONEY (= unconstrained NUMERIC; currency comes from the table)
+  //   MONEY (= unconstrained NUMERIC; currency is declared below)
   //   ACCOUNTING (creates schema-managed name, account, debit, and credit fields;
   //               account always selects a row from the profile's managed accounts table;
   //               name is limited to 10 characters and one stored row contributes
@@ -197,6 +190,10 @@ message ColumnDefinition {
   // When true, this numeric column is server-owned and projected from the
   // profile quantity ledger.
   bool quantity_ledger = 4;
+
+  // Canonical uppercase ISO-4217 currency code. Required for MONEY and forbidden
+  // for every other field type.
+  string currency = 5;
 }
 
 // Response after table creation (success + DDL preview).
@@ -299,7 +296,6 @@ message TableDetail {
   int64 id = 2;
   repeated ColumnDefinition columns = 3;
   repeated ScriptInfo scripts = 4;
-  string base_currency = 5;
   repeated string row_display_columns = 6;
   map<string, ColumnBehavior> column_behaviors = 7;
   string table_kind = 8;

common/proto/table_script.proto

@@ -210,8 +210,8 @@ message HydratedColumnValue {
   string value = 4;
   // Logical database type used to create a typed client ScriptValue.
   string field_type = 5;
-  // Related table's base currency for MONEY values; otherwise empty.
-  string base_currency = 6;
+  // Related MONEY column's currency; otherwise empty.
+  string currency = 6;
 }
 
 // One declared related-collection aggregate input for the client Steel context.
@@ -229,8 +229,8 @@ message HydratedAggregateValue {
   string value = 5;
   // Logical source-column type; empty for row-only aggregates.
   string field_type = 6;
-  // Aggregate table's base currency for MONEY values; otherwise empty.
-  string base_currency = 7;
+  // Aggregated MONEY column's currency; otherwise empty.
+  string currency = 7;
 }
 
 // Complete external dependency snapshot for client-side Steel execution.