From 1679d5a4b8392f1fed5c8f7db7b0ce8d6c361175 Mon Sep 17 00:00:00 2001
From: Ricardo Guilherme Schmidt <3esmit@gmail.com>
Date: Mon, 29 Jun 2026 12:35:08 -0300
Subject: [PATCH] fix(stablecoin): derive controller gain scale

---
 programs/integration_tests/tests/stablecoin.rs   |  6 +++++-
 programs/stablecoin/src/redemption_controller.rs | 15 ++++++++++++---
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/programs/integration_tests/tests/stablecoin.rs b/programs/integration_tests/tests/stablecoin.rs
index 450cb96..af61a8e 100644
--- a/programs/integration_tests/tests/stablecoin.rs
+++ b/programs/integration_tests/tests/stablecoin.rs
@@ -58,6 +58,10 @@ impl Ids {
         AccountId::new([8; 32])
     }
 
+    fn oracle_source() -> AccountId {
+        AccountId::new([10; 32])
+    }
+
     fn redemption_controller() -> AccountId {
         compute_redemption_controller_pda(
             Self::stablecoin_program(),
@@ -189,7 +193,7 @@ impl Accounts {
                 quote_asset: Ids::collateral_definition(),
                 price,
                 timestamp,
-                source_id: String::from("twap"),
+                source_id: Ids::oracle_source(),
                 confidence_interval: 0,
             }),
             nonce: Nonce(0),
diff --git a/programs/stablecoin/src/redemption_controller.rs b/programs/stablecoin/src/redemption_controller.rs
index 9f45433..f0783f6 100644
--- a/programs/stablecoin/src/redemption_controller.rs
+++ b/programs/stablecoin/src/redemption_controller.rs
@@ -2,11 +2,16 @@ use nssa_core::{
     account::{Account, AccountId, AccountWithMetadata, Data},
     program::{AccountPostState, ProgramId},
 };
-use stablecoin_core::{verify_redemption_controller_and_get_seed, RedemptionController};
+use stablecoin_core::{
+    verify_redemption_controller_and_get_seed, RedemptionController, CONTROLLER_GAIN_SCALE,
+};
 use token_core::TokenDefinition;
 use twap_oracle_core::OraclePriceAccount;
 
-const CONTROLLER_GAIN_SCALE_I128: i128 = 1_000_000_000;
+const CONTROLLER_GAIN_SCALE_I128: i128 = {
+    assert!(CONTROLLER_GAIN_SCALE <= i128::MAX as u128);
+    CONTROLLER_GAIN_SCALE as i128
+};
 
 /// Initialize the redemption-rate feedback controller for one stablecoin/feed pair.
 ///
@@ -345,6 +350,10 @@ mod tests {
         AccountId::new([3; 32])
     }
 
+    fn oracle_source_id() -> AccountId {
+        AccountId::new([15; 32])
+    }
+
     fn controller_id() -> AccountId {
         compute_redemption_controller_pda(
             STABLECOIN_PROGRAM_ID,
@@ -393,7 +402,7 @@ mod tests {
                     quote_asset: collateral_definition_id(),
                     price,
                     timestamp,
-                    source_id: "twap".to_owned(),
+                    source_id: oracle_source_id(),
                     confidence_interval: 0,
                 }),
                 nonce: Nonce(0),