diff --git a/libs/sdk-core/src/greenlight/node_api.rs b/libs/sdk-core/src/greenlight/node_api.rs
index 658fb6d1d..f2f68d053 100644
--- a/libs/sdk-core/src/greenlight/node_api.rs
+++ b/libs/sdk-core/src/greenlight/node_api.rs
@@ -808,7 +808,7 @@ impl Greenlight {
                 let mut key = hex::encode(&p.payment_hash);
                 key.push('|');
                 key.push_str(&p.groupid.to_string());
-                (key, (p.payment_hash.clone(), p.groupid))
+                (key, (p.payment_hash.clone(), p.groupid.to_string()))
             })
             .collect();
         let hash_group_values: Vec<_> = hash_groups.values().cloned().collect();
@@ -840,7 +840,7 @@ impl Greenlight {
         for send_pay in send_pays {
             let mut key = hex::encode(&send_pay.payment_hash);
             key.push('|');
-            key.push_str(&send_pay.groupid.to_string());
+            key.push_str(&send_pay.groupid);
             let payment = outbound_payments.entry(key).or_insert(SendPayAgg {
                 state: 0,
                 created_at: send_pay.created_at,
@@ -2147,7 +2147,7 @@ impl TryFrom<ListsendpaysPayments> for SendPay {
                 .created_index
                 .ok_or(NodeError::generic("missing created index"))?,
             updated_index: value.updated_index,
-            groupid: value.groupid,
+            groupid: value.groupid.to_string(),
             partid: value.partid,
             payment_hash: value.payment_hash,
             status: value.status.try_into()?,
diff --git a/libs/sdk-core/src/persist/migrations.rs b/libs/sdk-core/src/persist/migrations.rs
index 75f4d4fc4..f24235448 100644
--- a/libs/sdk-core/src/persist/migrations.rs
+++ b/libs/sdk-core/src/persist/migrations.rs
@@ -457,6 +457,31 @@ pub(crate) fn current_migrations() -> Vec<&'static str> {
        ",
        "DELETE FROM payments",
        "DELETE FROM cached_items WHERE key = 'sync_state'",
+       // Delete send_pays, re-create it with groupid column as TEXT
+       "
+       DROP TABLE send_pays;
+
+       CREATE TABLE send_pays (
+        created_index INTEGER PRIMARY KEY NOT NULL,
+        updated_index INTEGER,
+        groupid TEXT NOT NULL,
+        partid INTEGER,
+        payment_hash BLOB NOT NULL,
+        status INTEGER NOT NULL,
+        amount_msat INTEGER,
+        destination BLOB,
+        created_at INTEGER NOT NULL,
+        amount_sent_msat INTEGER,
+        label TEXT,
+        bolt11 TEXT,
+        description TEXT,
+        bolt12 TEXT,
+        payment_preimage BLOB,
+        erroronion BLOB
+       ) STRICT;
+
+       DELETE FROM cached_items WHERE key = 'sync_state';
+       ",
     ]
 }
 
diff --git a/libs/sdk-core/src/persist/send_pays.rs b/libs/sdk-core/src/persist/send_pays.rs
index e4055c8e3..fadb9be16 100644
--- a/libs/sdk-core/src/persist/send_pays.rs
+++ b/libs/sdk-core/src/persist/send_pays.rs
@@ -14,7 +14,13 @@ pub(crate) enum SendPayStatus {
 pub(crate) struct SendPay {
     pub created_index: u64,
     pub updated_index: Option<u64>,
-    pub groupid: u64,
+
+    // The cln_grpc groupid (u64) can contain 64 bit values (e.g. > 2^63). This leads to errors when
+    // trying to persist them in an SQLite INTEGER column, which holds signed 64 bit numbers (63 bit
+    // value + 1 bit for the sign).
+    // To map the full range of u64 values in SQLite, we treat this field as String, stored as TEXT.
+    pub groupid: String,
+
     pub partid: Option<u64>,
     pub payment_hash: Vec<u8>,
     pub status: SendPayStatus,
@@ -74,7 +80,7 @@ impl SqliteStorage {
 
     pub(crate) fn list_send_pays(
         &self,
-        hash_groups: &[(Vec<u8>, u64)],
+        hash_groups: &[(Vec<u8>, String)],
     ) -> PersistResult<Vec<SendPay>> {
         let conn = self.get_connection()?;
         let mut stmt = conn.prepare(