diff --git a/cmd/root.go b/cmd/root.go
index 9708ab1..f8352ff 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -7,6 +7,7 @@ import (
 	"errors"
 	"log/slog"
 	"os"
+	"strconv"
 
 	"git.staur.ca/stobbsm/kea-manage/ipv4/reservation"
 	"git.staur.ca/stobbsm/kea-manage/lib/database"
@@ -33,15 +34,6 @@ func Execute() {
 }
 
 func init() {
-	// Here you will define your flags and configuration settings.
-	// Cobra supports persistent flags, which, if defined here,
-	// will be global for your application.
-
-	// rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.kea-manage.yaml)")
-
-	// Cobra also supports local flags, which will only run
-	// when this action is called directly.
-	rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
 }
 
 // Manage kea dhcp host reservations in postgresql directly
@@ -51,26 +43,33 @@ func init() {
 
 func runMain(cmd *cobra.Command, args []string) {
 	reslist := []*reservation.ReservationV4{}
-	vlist := viper.Get("reservationV4").([]any)
+	vlist := viper.Get("reservationV4").(map[string]any)
 
-	for _, v := range vlist {
-		v := v.(map[string]any)
-		r := reservation.ReserveV4MacAddr(
-			v["type"].(string),
-			v["identifier"].(string),
-			v["ipv4"].(string),
-			v["hostname"].(string),
-			v["subnetid"].(int),
-		)
-		if !r.Validate() {
-			slog.Error("reservation", slog.Any("validate", r))
+	for k, v := range vlist {
+		v := v.([]any)
+		ki, err := strconv.ParseInt(k, 10, 0)
+		if err != nil {
+			slog.Error("reservation", slog.Any("subnetid", err.Error()))
 			continue
 		}
+		for _, vi := range v {
+			vi := vi.(map[string]any)
+			r := reservation.ReserveV4MacAddr(
+				vi["identifier"].(string),
+				vi["ipv4"].(string),
+				vi["hostname"].(string),
+				int(ki),
+			)
+			if !r.Validate() {
+				slog.Error("reservation", slog.Any("validate", r))
+				continue
+			}
 
-		reslist = append(
-			reslist,
-			r,
-		)
+			reslist = append(
+				reslist,
+				r,
+			)
+		}
 	}
 
 	slog.Debug("reslist", slog.Any("slice", reslist))
@@ -82,7 +81,11 @@ func runMain(cmd *cobra.Command, args []string) {
 		v := v
 		if err := pg.InsertResV4(v); err != nil {
 			if errors.As(err, &database.Exists) {
-				slog.Info("exists", slog.Any("reservation", *v))
+				if err := pg.UpdateResV4(v); err != nil {
+					slog.Error("update", slog.Any("reservation", *v))
+					continue
+				}
+				slog.Info("updated", slog.Any("hostname", v.Hostname))
 			} else {
 				slog.Error(err.Error())
 			}
diff --git a/ipv4/reservation/reservation.go b/ipv4/reservation/reservation.go
index ee5301c..57e6375 100644
--- a/ipv4/reservation/reservation.go
+++ b/ipv4/reservation/reservation.go
@@ -3,29 +3,24 @@ package reservation
 import (
 	"log/slog"
 
-	"git.staur.ca/stobbsm/kea-manage/lib/types"
 	"git.staur.ca/stobbsm/kea-manage/lib/validators/ipv4"
 	"git.staur.ca/stobbsm/kea-manage/lib/validators/macaddr"
-	typeValidator "git.staur.ca/stobbsm/kea-manage/lib/validators/types"
 )
 
 type ReservationV4 struct {
-	IdentifierType types.Identifier
-	SubnetID       int
-	Identifier     string
-	Ipv4           string
-	Hostname       string
-	typeName       string
+	SubnetID   int
+	Identifier string
+	Ipv4       string
+	Hostname   string
+	typeName   string
 }
 
-func ReserveV4MacAddr(identifierType string, identifier string, addr string, hostname string, subnet int) *ReservationV4 {
+func ReserveV4MacAddr(identifier string, addr string, hostname string, subnet int) *ReservationV4 {
 	r := &ReservationV4{
-		typeName:       identifierType,
-		IdentifierType: types.LookupIdentifier(identifierType),
-		SubnetID:       subnet,
-		Identifier:     identifier,
-		Ipv4:           addr,
-		Hostname:       hostname,
+		SubnetID:   subnet,
+		Identifier: identifier,
+		Ipv4:       addr,
+		Hostname:   hostname,
 	}
 
 	return r
@@ -36,11 +31,6 @@ func ReserveV4MacAddr(identifierType string, identifier string, addr string, hos
 // This does not validate against the database, just validates that the written configuration
 // is correct
 func (r *ReservationV4) Validate() bool {
-	if !typeValidator.IsValid(r.typeName) {
-		slog.Error("validate", slog.Any("reservationV4.type", "invalid"))
-		return false
-	}
-
 	if !ipv4.IsValid(r.Ipv4) {
 		slog.Error("validate", slog.Any("reservationV4.ipv4", r.Ipv4))
 		return false
diff --git a/kea-manage.sample.yaml b/kea-manage.sample.yaml
new file mode 100644
index 0000000..63b07cc
--- /dev/null
+++ b/kea-manage.sample.yaml
@@ -0,0 +1,16 @@
+database:
+  type: pgx
+  host: postgres.example.net
+  port: 5432
+  user: keauser
+  password: secure-kea-postgres-password
+  name: kea-database-name
+reservationV4:
+  <subnetid1>:
+    - identifier: "11:11:11:11:11:11"
+      hostname: hostname-to-reserve
+      ipv4: 192.168.111.2
+  <subnetid2>:
+    - identifier: "11:11:11:11:11:12"
+      hostname: another-hostname-to-reserve
+      ipv4: 192.168.112.2
diff --git a/lib/database/postgres/postgres.go b/lib/database/postgres/postgres.go
index edcf58a..9bcd5e1 100644
--- a/lib/database/postgres/postgres.go
+++ b/lib/database/postgres/postgres.go
@@ -6,6 +6,7 @@ import (
 
 	"git.staur.ca/stobbsm/kea-manage/ipv4/reservation"
 	"git.staur.ca/stobbsm/kea-manage/lib/database"
+	"git.staur.ca/stobbsm/kea-manage/lib/types"
 	"github.com/jackc/pgx/v5"
 )
 
@@ -46,7 +47,35 @@ func (p *Postgres) InsertResV4(r *reservation.ReservationV4) error {
 	}
 	defer tx.Rollback(context.Background())
 
-	ct, err := tx.Exec(context.Background(), insertIfNotExists, r.Identifier, r.IdentifierType, r.SubnetID, r.Ipv4, r.Hostname)
+	ct, err := tx.Exec(context.Background(), insertIfNotExists, r.Identifier, types.HwAddress.Int(), r.SubnetID, r.Ipv4, r.Hostname)
+	if err != nil {
+		return err
+	}
+
+	if err = tx.Commit(context.Background()); err != nil {
+		return err
+	}
+
+	if ct.RowsAffected() == 0 {
+		return database.Exists
+	}
+
+	return nil
+}
+
+func (p *Postgres) UpdateResV4(r *reservation.ReservationV4) error {
+	if err := p.connect(context.Background()); err != nil {
+		return err
+	}
+	defer p.close()
+
+	tx, err := p.conn.Begin(context.Background())
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback(context.Background())
+
+	ct, err := tx.Exec(context.Background(), update, r.Identifier, types.HwAddress.Int(), r.SubnetID, r.Ipv4, r.Hostname)
 	if err != nil {
 		return err
 	}
diff --git a/lib/database/postgres/queries.go b/lib/database/postgres/queries.go
index 2b04d2a..a79c051 100644
--- a/lib/database/postgres/queries.go
+++ b/lib/database/postgres/queries.go
@@ -24,3 +24,10 @@ const insertIfNotExists = `INSERT INTO hosts (dhcp_identifier,
 	WHERE dhcp4_subnet_id = $3
 	AND dhcp_identifier_type = $2
 	AND dhcp_identifier = DECODE(REPLACE($1, ':', ''), 'hex'));`
+
+const update = `UPDATE hosts
+	SET ipv4_address = (SELECT ($4::inet - '0.0.0.0'::inet)),
+	    hostname = $5
+	WHERE dhcp_identifier = (SELECT DECODE(REPLACE($1, ':', ''), 'hex')) AND
+		dhcp_identifier_type = $2 AND
+		dhcp4_subnet_id = $3;`