Added ownership reference + wallet creation methods

api/pkg/db/internal/mongo/chainassetsdb/db.go

@@ -0,0 +1,73 @@
+package chainassetsdb
+
+import (
+	ri "github.com/tech/sendico/pkg/db/repository/index"
+	"github.com/tech/sendico/pkg/db/template"
+	"github.com/tech/sendico/pkg/mlogger"
+	"github.com/tech/sendico/pkg/model"
+	"github.com/tech/sendico/pkg/mservice"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.uber.org/zap"
+)
+
+type ChainAssetsDB struct {
+	template.DBImp[*model.ChainAssetDescription]
+}
+
+func Create(logger mlogger.Logger, db *mongo.Database) (*ChainAssetsDB, error) {
+	p := &ChainAssetsDB{
+		DBImp: *template.Create[*model.ChainAssetDescription](logger, mservice.ChainAssets, db),
+	}
+
+	// 1) Canonical lookup: enforce single (chain, tokenSymbol)
+	if err := p.Repository.CreateIndex(&ri.Definition{
+		Name:   "idx_chain_symbol",
+		Unique: true,
+		Keys: []ri.Key{
+			{Field: "asset.chain", Sort: ri.Asc},
+			{Field: "asset.tokenSymbol", Sort: ri.Asc},
+		},
+	}); err != nil {
+		p.Logger.Error("failed index (chain, symbol) unique", zap.Error(err))
+		return nil, err
+	}
+
+	// 2) Prevent duplicate contracts inside the same chain, but only when contract exists
+	if err := p.Repository.CreateIndex(&ri.Definition{
+		Name:   "idx_chain_contract_unique",
+		Unique: true,
+		Sparse: true,
+		Keys: []ri.Key{
+			{Field: "asset.chain", Sort: ri.Asc},
+			{Field: "asset.contractAddress", Sort: ri.Asc},
+		},
+	}); err != nil {
+		p.Logger.Error("failed index (chain, contract) unique", zap.Error(err))
+		return nil, err
+	}
+
+	// 3) Fast contract lookup, skip docs without contractAddress (native assets)
+	if err := p.Repository.CreateIndex(&ri.Definition{
+		Name:   "idx_contract_lookup",
+		Sparse: true,
+		Keys: []ri.Key{
+			{Field: "asset.contractAddress", Sort: ri.Asc},
+		},
+	}); err != nil {
+		p.Logger.Error("failed index contract lookup", zap.Error(err))
+		return nil, err
+	}
+
+	// 4) List assets per chain
+	if err := p.Repository.CreateIndex(&ri.Definition{
+		Name: "idx_chain_list",
+		Keys: []ri.Key{
+			{Field: "asset.chain", Sort: ri.Asc},
+		},
+	}); err != nil {
+		p.Logger.Error("failed index chain list", zap.Error(err))
+		return nil, err
+	}
+
+	return p, nil
+}

api/pkg/db/internal/mongo/chainassetsdb/resolve.go

@@ -0,0 +1,18 @@
+package chainassetsdb
+
+import (
+	"context"
+
+	"github.com/tech/sendico/pkg/db/repository"
+	"github.com/tech/sendico/pkg/model"
+)
+
+func (db *ChainAssetsDB) Resolve(ctx context.Context, chainAsset model.ChainAssetKey) (*model.ChainAssetDescription, error) {
+	var assetDescription model.ChainAssetDescription
+	assetField := repository.Field("asset")
+	q := repository.Query().And(
+		repository.Query().Filter(assetField.Dot("chain"), chainAsset.Chain),
+		repository.Query().Filter(assetField.Dot("tokenSymbol"), chainAsset.TokenSymbol),
+	)
+	return &assetDescription, db.DBImp.FindOne(ctx, q, &assetDescription)
+}

api/pkg/db/internal/mongo/db.go

@@ -10,8 +10,10 @@ import (
 	"github.com/mitchellh/mapstructure"
 	"github.com/tech/sendico/pkg/auth"
 	"github.com/tech/sendico/pkg/db/account"
+	"github.com/tech/sendico/pkg/db/chainassets"
 	"github.com/tech/sendico/pkg/db/confirmation"
 	"github.com/tech/sendico/pkg/db/internal/mongo/accountdb"
+	"github.com/tech/sendico/pkg/db/internal/mongo/chainassetsdb"
 	"github.com/tech/sendico/pkg/db/internal/mongo/confirmationdb"
 	"github.com/tech/sendico/pkg/db/internal/mongo/invitationdb"
 	"github.com/tech/sendico/pkg/db/internal/mongo/organizationdb"
@@ -312,6 +314,10 @@ func collectReplicaHosts(configuredHosts []string, replicaSet, defaultPort, host
 	return hosts
 }
 
+func (db *DB) NewChainAsstesDB() (chainassets.DB, error) {
+	return chainassetsdb.Create(db.logger, db.db())
+}
+
 func (db *DB) Permissions() auth.Provider {
 	return db
 }

api/pkg/db/internal/mongo/repositoryimp/index.go

@@ -44,6 +44,9 @@ func (r *MongoRepository) CreateIndex(def *ri.Definition) error {
 	if def.PartialFilter != nil {
 		opts.SetPartialFilterExpression(def.PartialFilter.BuildQuery())
 	}
+	if def.Sparse {
+		opts.SetSparse(def.Sparse)
+	}
 
 	_, err := r.collection.Indexes().CreateOne(
 		context.Background(),