feat(indexer): add to modules and implement proto fields (#22544)

x/auth/module.go

@@ -8,10 +8,12 @@ import (
 	gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
 	"google.golang.org/grpc"
 
+	"cosmossdk.io/collections"
 	"cosmossdk.io/core/appmodule"
 	appmodulev2 "cosmossdk.io/core/appmodule/v2"
 	"cosmossdk.io/core/registry"
 	"cosmossdk.io/core/transaction"
+	"cosmossdk.io/schema"
 
 	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/cosmos/cosmos-sdk/codec"
@@ -198,3 +200,9 @@ func (AppModule) ProposalMsgsX(weights simsx.WeightSource, reg simsx.Registry) {
 func (am AppModule) RegisterStoreDecoder(sdr simtypes.StoreDecoderRegistry) {
 	sdr[types.StoreKey] = simtypes.NewStoreDecoderFuncFromCollectionsSchema(am.accountKeeper.Schema)
 }
+
+// ModuleCodec implements schema.HasModuleCodec.
+// It allows the indexer to decode the module's KVPairUpdate.
+func (am AppModule) ModuleCodec() (schema.ModuleCodec, error) {
+	return am.accountKeeper.Schema.ModuleCodec(collections.IndexingOptions{})
+}