Change fee settings from UI

src/Data/Models/ChannelOperationRequest.cs

@@ -116,6 +116,16 @@ public decimal Amount
         /// </summary>
         public decimal? FeeRate { get; set; }
 
+        /// <summary>
+        /// Initial base fee in millisatoshis to be applied when the channel is opened.
+        /// </summary>
+        public long? InitialChannelBaseFeeMsat { get; set; }
+
+        /// <summary>
+        /// Initial fee rate in parts per million to be applied when the channel is opened.
+        /// </summary>
+        public long? InitialChannelFeeRatePpm { get; set; }
+
         [Column(TypeName = "jsonb")]
         public List<ChannelStatusLog>? StatusLogs { get; set; } = new();
 

src/Helpers/Constants.cs

@@ -98,6 +98,9 @@ public class Constants
     public static readonly decimal MINIMUM_WITHDRAWAL_BTC_AMOUNT = 0.0m;
     public static readonly decimal MAXIMUM_WITHDRAWAL_BTC_AMOUNT = 21_000_000;
     public static readonly int TRANSACTION_CONFIRMATION_MINIMUM_BLOCKS;
+    public static int DEFAULT_CHANNEL_FEE_POLICY_TIMELOCK_DELTA_BLOCKS = 40;
+    public static long DEFAULT_CHANNEL_FEE_POLICY_BASE_FEE_MSAT = 1000; 
+    public static long DEFAULT_CHANNEL_FEE_POLICY_FEE_RATE_PPM = 500; // 500 ppm = 0.05%
     public static readonly long ANCHOR_CLOSINGS_MINIMUM_SATS;
     public static readonly long MINIMUM_SWEEP_TRANSACTION_AMOUNT_SATS = 25_000_000; //25M sats
     public static readonly string DEFAULT_DERIVATION_PATH = "48'/1'";
@@ -354,6 +357,15 @@ static Constants()
         var transactionConfBlocks = GetEnvironmentalVariableOrThrowIfNotTesting("TRANSACTION_CONFIRMATION_MINIMUM_BLOCKS");
         if (transactionConfBlocks != null) TRANSACTION_CONFIRMATION_MINIMUM_BLOCKS = int.Parse(transactionConfBlocks);
 
+        var defaultChannelFeePolicyTimelockDeltaBlocks = Environment.GetEnvironmentVariable("DEFAULT_CHANNEL_FEE_POLICY_TIMELOCK_DELTA_BLOCKS");
+        if (defaultChannelFeePolicyTimelockDeltaBlocks != null) DEFAULT_CHANNEL_FEE_POLICY_TIMELOCK_DELTA_BLOCKS = int.Parse(defaultChannelFeePolicyTimelockDeltaBlocks);
+
+        var defaultChannelFeePolicyBaseFeeMsat = Environment.GetEnvironmentVariable("DEFAULT_CHANNEL_FEE_POLICY_BASE_FEE_MSAT");
+        if (defaultChannelFeePolicyBaseFeeMsat != null) DEFAULT_CHANNEL_FEE_POLICY_BASE_FEE_MSAT = long.Parse(defaultChannelFeePolicyBaseFeeMsat);
+
+        var defaultChannelFeePolicyFeeRatePpm = Environment.GetEnvironmentVariable("DEFAULT_CHANNEL_FEE_POLICY_FEE_RATE_PPM");
+        if (defaultChannelFeePolicyFeeRatePpm != null) DEFAULT_CHANNEL_FEE_POLICY_FEE_RATE_PPM = long.Parse(defaultChannelFeePolicyFeeRatePpm);
+
         var anchorClosingMinSats = GetEnvironmentalVariableOrThrowIfNotTesting("ANCHOR_CLOSINGS_MINIMUM_SATS");
         if (anchorClosingMinSats != null) ANCHOR_CLOSINGS_MINIMUM_SATS = long.Parse(anchorClosingMinSats); // Check https://github.com/lightningnetwork/lnd/issues/6505#issuecomment-1120364460 to understand, we need 100K+ to support anchor channel closings