diff --git a/common/build.rs b/common/build.rs
index 4d05e10a..4b80a955 100644
--- a/common/build.rs
+++ b/common/build.rs
@@ -157,6 +157,10 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             ".komp_ac.table_definition.ColumnDefinition",
             "#[derive(serde::Serialize, serde::Deserialize)]",
         )
+        .field_attribute(
+            ".komp_ac.table_definition.ColumnDefinition.boolean_ledger_operator",
+            "#[serde(default)]",
+        )
         .type_attribute(
             ".komp_ac.table_definition.PostTableDefinitionRequest",
             "#[derive(serde::Serialize, serde::Deserialize)]",
diff --git a/common/proto/table_definition.proto b/common/proto/table_definition.proto
index 8dc9ecfe..3fbdfa63 100644
--- a/common/proto/table_definition.proto
+++ b/common/proto/table_definition.proto
@@ -291,8 +291,8 @@ message ColumnDefinition {
   // MONEY rounding applied before a value is stored.
   MoneyRounding rounding = 3;
 
-  // When true, this numeric column is server-owned and projected from the
-  // profile quantity ledger.
+  // When true, this numeric or Boolean column is server-owned and projected
+  // from ledger contributions.
   bool quantity_ledger = 4;
 
   // Canonical uppercase ISO-4217 currency code. Required for MONEY and forbidden
@@ -301,6 +301,16 @@ message ColumnDefinition {
 
   // When true, the server rejects omitted or explicitly null values.
   bool required = 6;
+
+  // Required for Boolean ledger columns and forbidden otherwise. ANY means
+  // one true contribution wins; ALL means one false contribution wins.
+  BooleanLedgerOperator boolean_ledger_operator = 7;
+}
+
+enum BooleanLedgerOperator {
+  BOOLEAN_LEDGER_OPERATOR_UNSPECIFIED = 0;
+  BOOLEAN_LEDGER_OPERATOR_ANY = 1;
+  BOOLEAN_LEDGER_OPERATOR_ALL = 2;
 }
 
 // Response after table creation (success + DDL preview).
diff --git a/common/src/proto/descriptor.bin b/common/src/proto/descriptor.bin
index 29713fe9..371c8cbe 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 3b8cb7f6..ac0ab261 100644
--- a/common/src/proto/komp_ac.table_definition.rs
+++ b/common/src/proto/komp_ac.table_definition.rs
@@ -255,8 +255,8 @@ pub struct ColumnDefinition {
     /// MONEY rounding applied before a value is stored.
     #[prost(enumeration = "MoneyRounding", tag = "3")]
     pub rounding: i32,
-    /// When true, this numeric column is server-owned and projected from the
-    /// profile quantity ledger.
+    /// When true, this numeric or Boolean column is server-owned and projected
+    /// from ledger contributions.
     #[prost(bool, tag = "4")]
     pub quantity_ledger: bool,
     /// Canonical uppercase ISO-4217 currency code. Required for MONEY and forbidden
@@ -266,6 +266,11 @@ pub struct ColumnDefinition {
     /// When true, the server rejects omitted or explicitly null values.
     #[prost(bool, tag = "6")]
     pub required: bool,
+    /// Required for Boolean ledger columns and forbidden otherwise. ANY means
+    /// one true contribution wins; ALL means one false contribution wins.
+    #[prost(enumeration = "BooleanLedgerOperator", tag = "7")]
+    #[serde(default)]
+    pub boolean_ledger_operator: i32,
 }
 /// Response after table creation (success + DDL preview).
 #[derive(serde::Serialize, serde::Deserialize)]
@@ -677,6 +682,35 @@ impl MoneyRounding {
         }
     }
 }
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, ::prost::Enumeration)]
+#[repr(i32)]
+pub enum BooleanLedgerOperator {
+    Unspecified = 0,
+    Any = 1,
+    All = 2,
+}
+impl BooleanLedgerOperator {
+    /// String value of the enum field names used in the ProtoBuf definition.
+    ///
+    /// The values are not transformed in any way and thus are considered stable
+    /// (if the ProtoBuf definition does not change) and safe for programmatic use.
+    pub fn as_str_name(&self) -> &'static str {
+        match self {
+            Self::Unspecified => "BOOLEAN_LEDGER_OPERATOR_UNSPECIFIED",
+            Self::Any => "BOOLEAN_LEDGER_OPERATOR_ANY",
+            Self::All => "BOOLEAN_LEDGER_OPERATOR_ALL",
+        }
+    }
+    /// Creates an enum from field names used in the ProtoBuf definition.
+    pub fn from_str_name(value: &str) -> ::core::option::Option<Self> {
+        match value {
+            "BOOLEAN_LEDGER_OPERATOR_UNSPECIFIED" => Some(Self::Unspecified),
+            "BOOLEAN_LEDGER_OPERATOR_ANY" => Some(Self::Any),
+            "BOOLEAN_LEDGER_OPERATOR_ALL" => Some(Self::All),
+            _ => None,
+        }
+    }
+}
 /// How a column type is spelled in ColumnDefinition.field_type.
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, ::prost::Enumeration)]
 #[repr(i32)]
diff --git a/server b/server
index 3b4f7ee7..554e98ec 160000
--- a/server
+++ b/server
@@ -1 +1 @@
-Subproject commit 3b4f7ee71ec316ead162c698f934b15959fcce27
+Subproject commit 554e98ec117ea09f9a856dcbc3c1c86b6768fc30