fix(rollapp): revert state info created_at removal (#1321)

proto/dymensionxyz/dymension/rollapp/state_info.proto

@@ -47,8 +47,14 @@ message StateInfo {
     // BDs is a list of block description objects (one per block)
     // the list must be ordered by height, starting from startHeight to startHeight+numBlocks-1
     BlockDescriptors BDs = 9 [(gogoproto.nullable) = false];
+    // created_at is the timestamp at which the StateInfo was created
+    google.protobuf.Timestamp created_at = 10 [
+        (gogoproto.stdtime) = true,
+        (gogoproto.nullable) = false,
+        (gogoproto.moretags) = "yaml:\"created_at\""
+    ];
     // DrsVersion is a DRS version used by the rollapp.
-    string drs_version = 10;
+    string drs_version = 11;
 }
 
 // StateInfoSummary is a compact representation of StateInfo

x/rollapp/keeper/msg_server_update_state.go

@@ -96,6 +96,7 @@ func (k msgServer) UpdateState(goCtx context.Context, msg *types.MsgUpdateState)
 	})
 
 	creationHeight := uint64(ctx.BlockHeight())
+	blockTime := ctx.BlockTime()
 	stateInfo := types.NewStateInfo(
 		msg.RollappId,
 		newIndex,
@@ -105,6 +106,7 @@ func (k msgServer) UpdateState(goCtx context.Context, msg *types.MsgUpdateState)
 		msg.DAPath,
 		creationHeight,
 		msg.BDs,
+		blockTime,
 		msg.DrsVersion,
 	)
 	// Write new state information to the store indexed by <RollappId,LatestStateInfoIndex>

x/rollapp/types/state_info.go

@@ -2,6 +2,7 @@ package types
 
 import (
 	"strconv"
+	"time"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 
@@ -17,6 +18,7 @@ func NewStateInfo(
 	daPath string,
 	height uint64,
 	BDs BlockDescriptors,
+	createdAt time.Time,
 	drsVersion string,
 ) *StateInfo {
 	stateInfoIndex := StateInfoIndex{RollappId: rollappId, Index: newIndex}
@@ -30,6 +32,7 @@ func NewStateInfo(
 		CreationHeight: height,
 		Status:         status,
 		BDs:            BDs,
+		CreatedAt:      createdAt,
 		DrsVersion:     drsVersion,
 	}
 }