diff --git a/cmd/boot-script-service/boot_data.go b/cmd/boot-script-service/boot_data.go
index 6addd10..4d7a4f8 100644
--- a/cmd/boot-script-service/boot_data.go
+++ b/cmd/boot-script-service/boot_data.go
@@ -484,10 +484,15 @@ func SqlGetBootParams(macs, xnames []string, nids []int32) (results []bssTypes.B
 }
 
 func StoreNew(bp bssTypes.BootParams) (error, string) {
-	// postgres.Add will handle duplicates, and it is called in New().
-	// Therefore, if Postgres is enabled, simply call Store().
+	// postgres.Add will handle duplicates.
 	if useSQL {
-		return Store(bp)
+		debugf("postgres.Add(%v)\n", bp)
+		if result, err := bssdb.Add(bp); err != nil {
+			return err, ""
+		} else {
+			debugf("postgres.Add(%v) result: %v\n", bp, result)
+			return err, uuid.New().String()
+		}
 	}
 
 	item := ""
@@ -544,13 +549,12 @@ func Store(bp bssTypes.BootParams) (error, string) {
 	debugf("Store(%v)\n", bp)
 
 	if useSQL {
-		debugf("postgres.Add(%v)\n", bp)
-		result, err := bssdb.Add(bp)
-		if err != nil {
+		debugf("postgres.Set(%v)\n", bp)
+		if err := bssdb.Set(bp); err != nil {
 			return err, ""
+		} else {
+			return err, uuid.New().String()
 		}
-		debugf("postgres.Add result: %v\n", result)
-		return err, uuid.New().String()
 	}
 
 	var kernel_id, initrd_id string
diff --git a/internal/postgres/bootparams.go b/internal/postgres/bootparams.go
index bdda4d7..cc079c4 100644
--- a/internal/postgres/bootparams.go
+++ b/internal/postgres/bootparams.go
@@ -1881,6 +1881,82 @@ func (bddb BootDataDatabase) Update(bp bssTypes.BootParams) (nodesUpdated []stri
 	return nodesUpdated, err
 }
 
+// Set modifies existing boot parameters, kernel, or initramfs URIs and adds any
+// new ones. Unlike Update, any nodes that do not already exist are added. Under
+// the hood, Set determines which nodes do not exist and calls Add to add them
+// with the new boot configuration, then determines which nodes do exist and
+// calls Update to update them with the new boot configuration.
+func (bddb BootDataDatabase) Set(bp bssTypes.BootParams) (err error) {
+	// Make sure the new content isn't blank.
+	lenParams := len(bp.Params)
+	lenKernUri := len(bp.Kernel)
+	lenInitrdUri := len(bp.Initrd)
+	if lenParams == 0 && lenKernUri == 0 && lenInitrdUri == 0 {
+		err = ErrPostgresUpdate{Err: fmt.Errorf("must specify at least one of params, kernel, or initrd")}
+		return err
+	}
+
+	// Create BootParams struct for _new_ nodes that will be added
+	addBp := bssTypes.BootParams{
+		Kernel: bp.Kernel,
+		Initrd: bp.Initrd,
+		Params: bp.Params,
+	}
+	_, addBp.Macs, addBp.Hosts, addBp.Nids, err = bddb.CheckNodeExistence(bp.Macs, bp.Hosts, bp.Nids)
+	if err != nil {
+		err = ErrPostgresUpdate{Err: err}
+		return err
+	}
+
+	// Create BootParams struct for _existing_ nodes that will be updated
+	updateBp := bssTypes.BootParams{
+		Kernel: bp.Kernel,
+		Initrd: bp.Initrd,
+		Params: bp.Params,
+	}
+	existingNodeList, err := bddb.GetNodesByItems(bp.Macs, bp.Hosts, bp.Nids)
+	if err != nil {
+		err = ErrPostgresAdd{Err: err}
+		return err
+	}
+	for _, node := range existingNodeList {
+		if node.BootMac != "" {
+			updateBp.Macs = append(updateBp.Macs, node.BootMac)
+		}
+		if node.Xname != "" {
+			updateBp.Hosts = append(updateBp.Hosts, node.Xname)
+		}
+		if node.Nid != 0 {
+			updateBp.Nids = append(updateBp.Nids, node.Nid)
+		}
+	}
+
+	// Add new nodes, boot config, boot group, and boot group assignments.
+	//
+	// The Add() function will take care of boot config/group deduplication.
+	if len(addBp.Macs) > 0 || len(addBp.Hosts) > 0 || len(addBp.Nids) > 0 {
+		_, err = bddb.Add(addBp)
+		if err != nil {
+			err = ErrPostgresSet{Err: fmt.Errorf("failed to add new boot configuration: %w", err)}
+			return err
+		}
+	}
+
+	// Update existing nodes, boot config, boot group, and boot group
+	// assignments.
+	//
+	// The Update() function will take care of the deletion of dangling
+	// configs.
+	if len(existingNodeList) > 0 {
+		_, err = bddb.Update(updateBp)
+		if err != nil {
+			err = ErrPostgresSet{Err: fmt.Errorf("failed to update existing boot configuration: %w", err)}
+		}
+	}
+
+	return err
+}
+
 // GetBootParamsAll returns a slice of bssTypes.BootParams that contains all of the boot
 // configurations for all nodes in the database. Each item contains node information (boot MAC
 // address (if present), XName (if present), NID (if present)) as well as its associated boot