program: update-min-margin-const-limit (#1802)

* program: update-min-margin-const-limit

* add CHANGELOG.md

Author: 0xbigz

CHANGELOG.md

@@ -11,12 +11,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - program: add new settle pnl invariants ([#1812](https://github.com/drift-labs/protocol-v2/pull/1812))
 - program: add update_perp_market_pnl_pool ([#1810](https://github.com/drift-labs/protocol-v2/pull/1810))
+- program: increase min margin ratio invariant constant ([#1802](https://github.com/drift-labs/protocol-v2/pull/1802))
 - program: update mark twap crank use 5min basis for bid/ask ([#1769](https://github.com/drift-labs/protocol-v2/pull/1769))
 
 ### Fixes
 
 - program: correct fee tier 5 volume requirement ([#1800](https://github.com/drift-labs/protocol-v2/pull/1800))
-
 - program: fix small number mark-twap-integer-bias ([#1783](https://github.com/drift-labs/protocol-v2/pull/1783))
 
 ### Breaking

programs/drift/src/math/constants.rs

@@ -186,7 +186,7 @@ pub const MAX_LIQUIDATION_SLIPPAGE_U128: u128 = 10_000; // expo = -2
 pub const MAX_MARK_TWAP_DIVERGENCE: u128 = 500_000; // expo = -3
 
 pub const MAX_MARGIN_RATIO: u32 = MARGIN_PRECISION; // 1x leverage
-pub const MIN_MARGIN_RATIO: u32 = MARGIN_PRECISION / 50; // 50x leverage
+pub const MIN_MARGIN_RATIO: u32 = 125; // 80x leverage
 pub const HIGH_LEVERAGE_MIN_MARGIN_RATIO: u32 = MARGIN_PRECISION / 200; // 200x leverage
 
 pub const MAX_BID_ASK_INVENTORY_SKEW_FACTOR: u64 = 10 * BID_ASK_SPREAD_PRECISION;