diff --git a/client b/client
index 949b8c78..443d7b9a 160000
--- a/client
+++ b/client
@@ -1 +1 @@
-Subproject commit 949b8c784d40e8889fb08b44dc591786412236fd
+Subproject commit 443d7b9ab9113dacf1de73b457b53dd759e5b63d
diff --git a/common/proto/table_definition.proto b/common/proto/table_definition.proto
index 4ce00d78..3cd4b0a6 100644
--- a/common/proto/table_definition.proto
+++ b/common/proto/table_definition.proto
@@ -193,6 +193,9 @@ message ColumnDefinition {
   // Canonical uppercase ISO-4217 currency code. Required for MONEY and forbidden
   // for every other field type.
   string currency = 5;
+
+  // When true, the server rejects omitted or explicitly null values.
+  bool required = 6;
 }
 
 // Response after table creation (success + DDL preview).
diff --git a/common/src/proto/descriptor.bin b/common/src/proto/descriptor.bin
index 0bd23bba..ef79f907 100644
Binary files a/common/src/proto/descriptor.bin and b/common/src/proto/descriptor.bin differ
diff --git a/common/src/proto/komp_ac.table_definition.rs b/common/src/proto/komp_ac.table_definition.rs
index 7c2078a2..257ebf27 100644
--- a/common/src/proto/komp_ac.table_definition.rs
+++ b/common/src/proto/komp_ac.table_definition.rs
@@ -158,6 +158,9 @@ pub struct ColumnDefinition {
     /// for every other field type.
     #[prost(string, tag = "5")]
     pub currency: ::prost::alloc::string::String,
+    /// When true, the server rejects omitted or explicitly null values.
+    #[prost(bool, tag = "6")]
+    pub required: bool,
 }
 /// Response after table creation (success + DDL preview).
 #[derive(serde::Serialize, serde::Deserialize)]
diff --git a/server b/server
index 4fe6da6a..f0945096 160000
--- a/server
+++ b/server
@@ -1 +1 @@
-Subproject commit 4fe6da6ac72f37cd082607e2c9c9489d48bfa4ed
+Subproject commit f09450969170f8a098b38dff6c07d57ddf27b17e
diff --git a/web/src/schema/mod.rs b/web/src/schema/mod.rs
index 776f3900..ccdd598a 100644
--- a/web/src/schema/mod.rs
+++ b/web/src/schema/mod.rs
@@ -731,6 +731,7 @@ pub(crate) fn proto_columns(columns: &[ColumnDefinition]) -> Vec<ProtoColumnDefi
             },
             quantity_ledger: column.quantity_ledger,
             currency: column.currency.clone(),
+            required: false,
         })
         .collect()
 }