feat: adjustable fee configs

internal/migrations/023-fee-configs.sql

@@ -0,0 +1,28 @@
+-- Fee configuration table for ERC20 bridge operations
+-- Stores configurable fees and treasury address for deposit and withdraw operations
+
+CREATE TABLE IF NOT EXISTS fee_configs (
+    operation_type TEXT NOT NULL,
+    fee_percentage NUMERIC(4, 4) NOT NULL,
+    treasury_address TEXT NOT NULL,
+    created_at INT8 NOT NULL,
+    updated_at INT8 NOT NULL,
+
+    PRIMARY KEY (operation_type),
+
+    -- Constraints
+    CHECK (operation_type IN ('deposit', 'withdraw')),
+    CHECK (fee_percentage >= 0 AND fee_percentage <= 1), -- 0% to 100%
+    CHECK (treasury_address LIKE '0x%' AND LENGTH(treasury_address) = 42)
+);
+
+-- Action to get fee configuration by operation type
+CREATE OR REPLACE ACTION get_fee_config_by_type($operation_type TEXT) 
+PUBLIC VIEW RETURNS (
+    fee_percentage NUMERIC(4, 4),
+    treasury_address TEXT
+) {
+    FOR $config IN SELECT fee_percentage, treasury_address FROM fee_configs WHERE operation_type = $operation_type {
+        RETURN $config.fee_percentage, $config.treasury_address;
+    }
+};

internal/migrations/024-erc20-bridge.sql

@@ -0,0 +1,70 @@
+CREATE OR REPLACE ACTION get_erc20_bridge_info() 
+PUBLIC VIEW RETURNS (
+  chain TEXT,
+  escrow TEXT,
+  epoch_period TEXT,
+  erc20 TEXT,
+  decimals INT,
+  balance NUMERIC(78, 0),
+  synced BOOLEAN,
+  synced_at INT8,
+  enabled BOOLEAN
+) {
+  FOR $row IN sepolia_bridge.info() {
+    RETURN $row.chain, $row.escrow, $row.epoch_period, $row.erc20, $row.decimals, $row.balance, $row.synced, $row.synced_at, $row.enabled;
+  }
+};
+
+-- TESTNET
+CREATE OR REPLACE ACTION sepolia_wallet_balance($wallet_address TEXT) PUBLIC VIEW RETURNS (balance NUMERIC(78, 0)) {
+  $balance := sepolia_bridge.balance($wallet_address);
+  RETURN $balance;
+};
+
+CREATE OR REPLACE ACTION sepolia_admin_bridge_tokens($amount TEXT) PUBLIC {
+  $num_amount := $amount::NUMERIC(78, 0);
+
+  -- Get fee configuration for withdraw
+  $found := 0;
+  FOR $config IN SELECT fee_percentage, treasury_address FROM fee_configs WHERE operation_type = 'withdraw' ORDER BY created_at DESC LIMIT 1 {
+    $fee := $num_amount * $config.fee_percentage;
+
+    IF $fee > 0::NUMERIC(78, 0) {
+      sepolia_bridge.lock($fee);
+      sepolia_bridge.unlock($config.treasury_address, $fee);
+    }
+
+    -- Bridge the rest to users
+    sepolia_bridge.bridge($num_amount - $fee);
+    $found := 1;
+  }
+
+  IF $found = 0 { ERROR('No fee_configs rows for operation_type=withdraw'); }
+};
+
+-- MAINNET
+CREATE OR REPLACE ACTION mainnet_wallet_balance($wallet_address TEXT) PUBLIC VIEW RETURNS (balance NUMERIC(78, 0)) {
+  $balance := mainnet_bridge.balance($wallet_address);
+  RETURN $balance;
+};
+
+CREATE OR REPLACE ACTION mainnet_admin_bridge_tokens($amount TEXT) PUBLIC {
+  $num_amount := $amount::NUMERIC(78, 0);
+
+  -- Get fee configuration for withdraw
+  $found := 0;
+  FOR $config IN SELECT fee_percentage, treasury_address FROM fee_configs WHERE operation_type = 'withdraw' ORDER BY created_at DESC LIMIT 1 {
+    $fee := $num_amount * $config.fee_percentage;
+
+    IF $fee > 0::NUMERIC(78, 0) {
+      mainnet_bridge.lock($fee);
+      mainnet_bridge.unlock($config.treasury_address, $fee);
+    }
+
+    -- Bridge the rest to users
+    mainnet_bridge.bridge($num_amount - $fee);
+    $found := 1;
+  }
+
+  IF $found = 0 { ERROR('No fee_configs rows for operation_type=withdraw'); }
+};