diff --git a/pkg/models/db.go b/pkg/models/db.go
index 213f623..fe1ac9c 100644
--- a/pkg/models/db.go
+++ b/pkg/models/db.go
@@ -7,7 +7,7 @@ import (
 )
 
 type BaseModel struct {
-	Id          string    `json:"id" pg:"id,pk"`
+	Id          string    `json:"id" pg:"id,pk,notnull"`
 	DateCreated time.Time `json:"dateCreated" pg:"date_created"`
 	DateUpdated time.Time `json:"dateUpdated" pg:"date_updated"`
 }
diff --git a/pkg/models/register.go b/pkg/models/register.go
index d612d71..7ddef46 100644
--- a/pkg/models/register.go
+++ b/pkg/models/register.go
@@ -4,9 +4,9 @@ type User struct {
 	tableName struct{} `pg:"users,alias:users"`
 	BaseModel
 	IsActive bool   `json:"isActive" pg:"is_active" form:"isActive"`
-	Username string `json:"username" pg:"username" form:"username"`
-	Password string `json:"password" pg:"password" form:"password"`
-	Email    string `json:"email" pg:"email" form:"email"`
+	Username string `json:"username" pg:"username,notnull" form:"username"`
+	Password string `json:"password" pg:"password,notnull" form:"password"`
+	Email    string `json:"email" pg:"email,notnull" form:"email"`
 }
 
 type UserReturnInfo struct {
diff --git a/pkg/models/subscriptionTypes.go b/pkg/models/subscriptionTypes.go
index eb1c053..84ce657 100644
--- a/pkg/models/subscriptionTypes.go
+++ b/pkg/models/subscriptionTypes.go
@@ -4,7 +4,7 @@ type SubscriptionType struct {
 	tableName struct{} `pg:"subscriptionTypes,alias:subscriptionTypes"`
 	BaseModel
 	Name string `json:"name" pg:"name"`
-	Type string `json:"type" pg:"type"`
+	Type string `json:"type" pg:"type,notnull"`
 }
 
 type NewSubscriptionTypeBody struct {
diff --git a/pkg/models/subscriptions.go b/pkg/models/subscriptions.go
index 4cff8f5..65a1a86 100644
--- a/pkg/models/subscriptions.go
+++ b/pkg/models/subscriptions.go
@@ -9,18 +9,18 @@ type Subscription struct {
 	tableName struct{} `pg:"subscriptions,alias:subscriptions"`
 	BaseModel
 	Description         string            `json:"description" pg:"description"`
-	StartDate           time.Time         `json:"startDate" pg:"start_date", type:timestamp`
-	EndDate             time.Time         `json:"endDate" pg:"end_date", type:timestamp`
+	StartDate           time.Time         `json:"startDate" pg:"start_date", type:timestamptz`
+	EndDate             time.Time         `json:"endDate" pg:"end_date", type:timestamptz`
 	HasEnd              bool              `json:"hasEnd" pg:"hasEnd"`
 	SubscriptionTypeID  string            `json:"subscriptionTypeId" pg:"subscription_type_id"`
 	SubscriptionType    *SubscriptionType `json:"subscriptionType", pg:"rel:has-one, fk:subscription_type_id"`
-	CustomRange         int               `json:"customRange", pg:"custom_range"`
+	CustomRange         int               `json:"customRange", pg:"custom_range,default:1"`
 	WalletID            string            `json:"walletId", pg:"wallet_id"`
 	Wallet              *Wallet           `json:"wallet" pg:"rel:has-one, fk:wallet_id"`
 	TransactionTypeID   string            `json:"transactionTypeId", pg:"transaction_type_id"`
 	TransactionType     *TransactionType  `json:"transactionType", pg:"rel:has-one, fk:transaction_type_id"`
-	LastTransactionDate time.Time         `json:"lastTransactionDate", pg:"last_transaction_date", type:timestamp`
-	Amount              float32           `json:"amount", pg:"amount"`
+	LastTransactionDate time.Time         `json:"lastTransactionDate", pg:"last_transaction_date", type:timestamptz`
+	Amount              float32           `json:"amount", pg:"amount,default:0"`
 }
 
 type NewSubscriptionBody struct {
diff --git a/pkg/models/transactionTypes.go b/pkg/models/transactionTypes.go
index db0a4b0..32f8958 100644
--- a/pkg/models/transactionTypes.go
+++ b/pkg/models/transactionTypes.go
@@ -4,7 +4,7 @@ type TransactionType struct {
 	tableName struct{} `pg:"transactionTypes,alias:transactionTypes"`
 	BaseModel
 	Name string `json:"name" pg:"name"`
-	Type string `json:"type" pg:"type"`
+	Type string `json:"type" pg:"type,notnull"`
 }
 
 type NewTransactionTypeBody struct {
diff --git a/pkg/models/transactions.go b/pkg/models/transactions.go
index 980ff0b..6dd9de9 100644
--- a/pkg/models/transactions.go
+++ b/pkg/models/transactions.go
@@ -12,9 +12,9 @@ type Transaction struct {
 	TransactionTypeID string           `json:"transactionTypeId", pg:"transaction_type_id"`
 	TransactionType   *TransactionType `json:"transactionType", pg:"rel:has-one, fk:transaction_type_id"`
 	WalletID          string           `json:"walletId", pg:"wallet_id"`
-	Amount            float32          `json:"amount", pg:"amount"`
+	Amount            float32          `json:"amount", pg:"amount,default:0"`
 	Wallet            *Wallet          `json:"wallet" pg:"rel:has-one, fk:wallet_id"`
-	TransactionDate   time.Time        `json:"transactionDate" pg:"transaction_date, type:timestamp"`
+	TransactionDate   time.Time        `json:"transactionDate" pg:"transaction_date, type:timestamptz"`
 	SubscriptionID    string           `json:"subscriptionId", pg:"subscription_id"`
 	Subscription      *Subscription    `json:"subscription", pg:"rel:has-one, fk:subscription_id"`
 }