diff --git a/client b/client
index 643795a..6da324a 160000
--- a/client
+++ b/client
@@ -1 +1 @@
-Subproject commit 643795ac6f9dff97bd9595b344b0d659bb4c6c37
+Subproject commit 6da324a924df6c2a4917c2085e83816e9b464702
diff --git a/common/proto/table_script.proto b/common/proto/table_script.proto
index 2d5a71f..7cb680a 100644
--- a/common/proto/table_script.proto
+++ b/common/proto/table_script.proto
@@ -70,6 +70,12 @@ message PostTableScriptRequest {
   //       • current-table references are read directly from the active row
   //       • other tables require an explicit link from the source table
   //         (table_definition_links) or the request fails
+  //   - Related collections use allowlisted aggregate shorthand:
+  //       @sum(table.column), @min(table.column), @max(table.column),
+  //       @count(table.column), @count_distinct(table.column),
+  //       @any(table.boolean), @all(table.boolean),
+  //       @count_rows(table), @exists(table)
+  //       The related table must be a direct child or share exactly one parent.
   //   - Raw SQL access is not supported; steel_query_sql is rejected
   //
   // Math operations:
@@ -130,4 +136,7 @@ message ScriptDependency {
   string column = 3;
   // Deprecated legacy field. Raw SQL dependencies are no longer produced.
   string query_fragment = 4;
+  string operation = 5;
+  // Relationship table used to match the owner row to the related collection.
+  string via_table = 6;
 }
diff --git a/common/src/proto/descriptor.bin b/common/src/proto/descriptor.bin
index a79f34b..d174007 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_script.rs b/common/src/proto/komp_ac.table_script.rs
index f190859..ca5cd46 100644
--- a/common/src/proto/komp_ac.table_script.rs
+++ b/common/src/proto/komp_ac.table_script.rs
@@ -29,6 +29,12 @@ pub struct PostTableScriptRequest {
     ///   • current-table references are read directly from the active row
     ///   • other tables require an explicit link from the source table
     ///   (table_definition_links) or the request fails
+    /// * Related collections use allowlisted aggregate shorthand:
+    ///   @sum(table.column), @min(table.column), @max(table.column),
+    ///   @count(table.column), @count_distinct(table.column),
+    ///   @any(table.boolean), @all(table.boolean),
+    ///   @count_rows(table), @exists(table)
+    ///   The related table must be a direct child or share exactly one parent.
     /// * Raw SQL access is not supported; steel_query_sql is rejected
     ///
     /// Math operations:
@@ -107,6 +113,11 @@ pub struct ScriptDependency {
     /// Deprecated legacy field. Raw SQL dependencies are no longer produced.
     #[prost(string, tag = "4")]
     pub query_fragment: ::prost::alloc::string::String,
+    #[prost(string, tag = "5")]
+    pub operation: ::prost::alloc::string::String,
+    /// Relationship table used to match the owner row to the related collection.
+    #[prost(string, tag = "6")]
+    pub via_table: ::prost::alloc::string::String,
 }
 /// Generated client implementations.
 pub mod table_script_client {
diff --git a/server b/server
index 37f329a..1bbb78b 160000
--- a/server
+++ b/server
@@ -1 +1 @@
-Subproject commit 37f329a2b20a569c5cb3cfc6f01c1f790d3631a9
+Subproject commit 1bbb78b494af32a13b6ab039d635df1cdae3cf6e