diff --git a/internal/handlers/accounts.go b/internal/handlers/accounts.go
index 9ef9521..d5ddcd8 100644
--- a/internal/handlers/accounts.go
+++ b/internal/handlers/accounts.go
@@ -62,7 +62,7 @@ func GetTradingAccount(tx *db.Tx, userid int64, securityid int64) (*models.Accou
 	var tradingAccount models.Account
 	var account models.Account
 
-	user, err := GetUser(tx, userid)
+	user, err := tx.GetUser(userid)
 	if err != nil {
 		return nil, err
 	}
@@ -79,7 +79,7 @@ func GetTradingAccount(tx *db.Tx, userid int64, securityid int64) (*models.Accou
 		return nil, err
 	}
 
-	security, err := GetSecurity(tx, securityid, userid)
+	security, err := tx.GetSecurity(securityid, userid)
 	if err != nil {
 		return nil, err
 	}
@@ -124,7 +124,7 @@ func GetImbalanceAccount(tx *db.Tx, userid int64, securityid int64) (*models.Acc
 		return nil, err
 	}
 
-	security, err := GetSecurity(tx, securityid, userid)
+	security, err := tx.GetSecurity(securityid, userid)
 	if err != nil {
 		return nil, err
 	}
@@ -280,7 +280,7 @@ func AccountHandler(r *http.Request, context *Context) ResponseWriterWriter {
 		account.UserId = user.UserId
 		account.AccountVersion = 0
 
-		security, err := GetSecurity(context.Tx, account.SecurityId, user.UserId)
+		security, err := context.Tx.GetSecurity(account.SecurityId, user.UserId)
 		if err != nil {
 			log.Print(err)
 			return NewError(999 /*Internal Error*/)
@@ -341,7 +341,7 @@ func AccountHandler(r *http.Request, context *Context) ResponseWriterWriter {
 			}
 			account.UserId = user.UserId
 
-			security, err := GetSecurity(context.Tx, account.SecurityId, user.UserId)
+			security, err := context.Tx.GetSecurity(account.SecurityId, user.UserId)
 			if err != nil {
 				log.Print(err)
 				return NewError(999 /*Internal Error*/)
diff --git a/internal/handlers/imports.go b/internal/handlers/imports.go
index 08267d3..ea74042 100644
--- a/internal/handlers/imports.go
+++ b/internal/handlers/imports.go
@@ -159,7 +159,7 @@ func ofxImportHelper(tx *db.Tx, r io.Reader, user *models.User, accountid int64)
 				split := new(models.Split)
 				r := new(big.Rat)
 				r.Neg(&imbalance)
-				security, err := GetSecurity(tx, imbalanced_security, user.UserId)
+				security, err := tx.GetSecurity(imbalanced_security, user.UserId)
 				if err != nil {
 					log.Print(err)
 					return NewError(999 /*Internal Error*/)
diff --git a/internal/handlers/prices.go b/internal/handlers/prices.go
index 620150d..f08d37e 100644
--- a/internal/handlers/prices.go
+++ b/internal/handlers/prices.go
@@ -97,7 +97,7 @@ func GetClosestPrice(tx *db.Tx, security, currency *models.Security, date *time.
 }
 
 func PriceHandler(r *http.Request, context *Context, user *models.User, securityid int64) ResponseWriterWriter {
-	security, err := GetSecurity(context.Tx, securityid, user.UserId)
+	security, err := context.Tx.GetSecurity(securityid, user.UserId)
 	if err != nil {
 		return NewError(3 /*Invalid Request*/)
 	}
@@ -112,7 +112,7 @@ func PriceHandler(r *http.Request, context *Context, user *models.User, security
 		if price.SecurityId != security.SecurityId {
 			return NewError(3 /*Invalid Request*/)
 		}
-		_, err = GetSecurity(context.Tx, price.CurrencyId, user.UserId)
+		_, err = context.Tx.GetSecurity(price.CurrencyId, user.UserId)
 		if err != nil {
 			return NewError(3 /*Invalid Request*/)
 		}
@@ -161,11 +161,11 @@ func PriceHandler(r *http.Request, context *Context, user *models.User, security
 				return NewError(3 /*Invalid Request*/)
 			}
 
-			_, err = GetSecurity(context.Tx, price.SecurityId, user.UserId)
+			_, err = context.Tx.GetSecurity(price.SecurityId, user.UserId)
 			if err != nil {
 				return NewError(3 /*Invalid Request*/)
 			}
-			_, err = GetSecurity(context.Tx, price.CurrencyId, user.UserId)
+			_, err = context.Tx.GetSecurity(price.CurrencyId, user.UserId)
 			if err != nil {
 				return NewError(3 /*Invalid Request*/)
 			}
diff --git a/internal/handlers/securities.go b/internal/handlers/securities.go
index e836822..ec9544b 100644
--- a/internal/handlers/securities.go
+++ b/internal/handlers/securities.go
@@ -4,7 +4,6 @@ package handlers
 
 import (
 	"errors"
-	"fmt"
 	"github.com/aclindsa/moneygo/internal/models"
 	"github.com/aclindsa/moneygo/internal/store/db"
 	"log"
@@ -51,90 +50,18 @@ func FindCurrencyTemplate(iso4217 int64) *models.Security {
 	return nil
 }
 
-func GetSecurity(tx *db.Tx, securityid int64, userid int64) (*models.Security, error) {
-	var s models.Security
-
-	err := tx.SelectOne(&s, "SELECT * from securities where UserId=? AND SecurityId=?", userid, securityid)
-	if err != nil {
-		return nil, err
-	}
-	return &s, nil
-}
-
-func GetSecurities(tx *db.Tx, userid int64) (*[]*models.Security, error) {
-	var securities []*models.Security
-
-	_, err := tx.Select(&securities, "SELECT * from securities where UserId=?", userid)
-	if err != nil {
-		return nil, err
-	}
-	return &securities, nil
-}
-
-func InsertSecurity(tx *db.Tx, s *models.Security) error {
-	err := tx.Insert(s)
-	if err != nil {
-		return err
-	}
-	return nil
-}
-
 func UpdateSecurity(tx *db.Tx, s *models.Security) (err error) {
-	user, err := GetUser(tx, s.UserId)
+	user, err := tx.GetUser(s.UserId)
 	if err != nil {
 		return
 	} else if user.DefaultCurrency == s.SecurityId && s.Type != models.Currency {
 		return errors.New("Cannot change security which is user's default currency to be non-currency")
 	}
 
-	count, err := tx.Update(s)
+	err = tx.UpdateSecurity(s)
 	if err != nil {
 		return
 	}
-	if count > 1 {
-		return fmt.Errorf("Updated %d securities (expected 1)", count)
-	}
-
-	return nil
-}
-
-type SecurityInUseError struct {
-	message string
-}
-
-func (e SecurityInUseError) Error() string {
-	return e.message
-}
-
-func DeleteSecurity(tx *db.Tx, s *models.Security) error {
-	// First, ensure no accounts are using this security
-	accounts, err := tx.SelectInt("SELECT count(*) from accounts where UserId=? and SecurityId=?", s.UserId, s.SecurityId)
-
-	if accounts != 0 {
-		return SecurityInUseError{"One or more accounts still use this security"}
-	}
-
-	user, err := GetUser(tx, s.UserId)
-	if err != nil {
-		return err
-	} else if user.DefaultCurrency == s.SecurityId {
-		return SecurityInUseError{"Cannot delete security which is user's default currency"}
-	}
-
-	// Remove all prices involving this security (either of this security, or
-	// using it as a currency)
-	_, err = tx.Exec("DELETE FROM prices WHERE SecurityId=? OR CurrencyId=?", s.SecurityId, s.SecurityId)
-	if err != nil {
-		return err
-	}
-
-	count, err := tx.Delete(s)
-	if err != nil {
-		return err
-	}
-	if count != 1 {
-		return errors.New("Deleted more than one security")
-	}
 
 	return nil
 }
@@ -143,16 +70,14 @@ func ImportGetCreateSecurity(tx *db.Tx, userid int64, security *models.Security)
 	security.UserId = userid
 	if len(security.AlternateId) == 0 {
 		// Always create a new local security if we can't match on the AlternateId
-		err := InsertSecurity(tx, security)
+		err := tx.InsertSecurity(security)
 		if err != nil {
 			return nil, err
 		}
 		return security, nil
 	}
 
-	var securities []*models.Security
-
-	_, err := tx.Select(&securities, "SELECT * from securities where UserId=? AND Type=? AND AlternateId=? AND Preciseness=?", userid, security.Type, security.AlternateId, security.Precision)
+	securities, err := tx.FindMatchingSecurities(userid, security)
 	if err != nil {
 		return nil, err
 	}
@@ -160,7 +85,7 @@ func ImportGetCreateSecurity(tx *db.Tx, userid int64, security *models.Security)
 	// First try to find a case insensitive match on the name or symbol
 	upperName := strings.ToUpper(security.Name)
 	upperSymbol := strings.ToUpper(security.Symbol)
-	for _, s := range securities {
+	for _, s := range *securities {
 		if (len(s.Name) > 0 && strings.ToUpper(s.Name) == upperName) ||
 			(len(s.Symbol) > 0 && strings.ToUpper(s.Symbol) == upperSymbol) {
 			return s, nil
@@ -169,7 +94,7 @@ func ImportGetCreateSecurity(tx *db.Tx, userid int64, security *models.Security)
 	//		if strings.Contains(strings.ToUpper(security.Name), upperSearch) ||
 
 	// Try to find a partial string match on the name or symbol
-	for _, s := range securities {
+	for _, s := range *securities {
 		sUpperName := strings.ToUpper(s.Name)
 		sUpperSymbol := strings.ToUpper(s.Symbol)
 		if (len(upperName) > 0 && len(s.Name) > 0 && (strings.Contains(upperName, sUpperName) || strings.Contains(sUpperName, upperName))) ||
@@ -179,12 +104,12 @@ func ImportGetCreateSecurity(tx *db.Tx, userid int64, security *models.Security)
 	}
 
 	// Give up and return the first security in the list
-	if len(securities) > 0 {
-		return securities[0], nil
+	if len(*securities) > 0 {
+		return (*securities)[0], nil
 	}
 
 	// If there wasn't even one security in the list, make a new one
-	err = InsertSecurity(tx, security)
+	err = tx.InsertSecurity(security)
 	if err != nil {
 		return nil, err
 	}
@@ -217,7 +142,7 @@ func SecurityHandler(r *http.Request, context *Context) ResponseWriterWriter {
 		security.SecurityId = -1
 		security.UserId = user.UserId
 
-		err = InsertSecurity(context.Tx, &security)
+		err = context.Tx.InsertSecurity(&security)
 		if err != nil {
 			log.Print(err)
 			return NewError(999 /*Internal Error*/)
@@ -229,7 +154,7 @@ func SecurityHandler(r *http.Request, context *Context) ResponseWriterWriter {
 			//Return all securities
 			var sl models.SecurityList
 
-			securities, err := GetSecurities(context.Tx, user.UserId)
+			securities, err := context.Tx.GetSecurities(user.UserId)
 			if err != nil {
 				log.Print(err)
 				return NewError(999 /*Internal Error*/)
@@ -250,7 +175,7 @@ func SecurityHandler(r *http.Request, context *Context) ResponseWriterWriter {
 				return PriceHandler(r, context, user, securityid)
 			}
 
-			security, err := GetSecurity(context.Tx, securityid, user.UserId)
+			security, err := context.Tx.GetSecurity(securityid, user.UserId)
 			if err != nil {
 				return NewError(3 /*Invalid Request*/)
 			}
@@ -284,13 +209,13 @@ func SecurityHandler(r *http.Request, context *Context) ResponseWriterWriter {
 
 			return &security
 		} else if r.Method == "DELETE" {
-			security, err := GetSecurity(context.Tx, securityid, user.UserId)
+			security, err := context.Tx.GetSecurity(securityid, user.UserId)
 			if err != nil {
 				return NewError(3 /*Invalid Request*/)
 			}
 
-			err = DeleteSecurity(context.Tx, security)
-			if _, ok := err.(SecurityInUseError); ok {
+			err = context.Tx.DeleteSecurity(security)
+			if _, ok := err.(db.SecurityInUseError); ok {
 				return NewError(7 /*In Use Error*/)
 			} else if err != nil {
 				log.Print(err)
diff --git a/internal/handlers/securities_lua.go b/internal/handlers/securities_lua.go
index a5307c6..78716f2 100644
--- a/internal/handlers/securities_lua.go
+++ b/internal/handlers/securities_lua.go
@@ -27,7 +27,7 @@ func luaContextGetSecurities(L *lua.LState) (map[int64]*models.Security, error)
 			return nil, errors.New("Couldn't find User in lua's Context")
 		}
 
-		securities, err := GetSecurities(tx, user.UserId)
+		securities, err := tx.GetSecurities(user.UserId)
 		if err != nil {
 			return nil, err
 		}
diff --git a/internal/handlers/sessions.go b/internal/handlers/sessions.go
index f4d6c5e..71deff4 100644
--- a/internal/handlers/sessions.go
+++ b/internal/handlers/sessions.go
@@ -85,12 +85,15 @@ func SessionHandler(r *http.Request, context *Context) ResponseWriterWriter {
 			return NewError(3 /*Invalid Request*/)
 		}
 
-		dbuser, err := GetUserByUsername(context.Tx, user.Username)
+		// Hash password before checking username to help mitigate timing
+		// attacks
+		user.HashPassword()
+
+		dbuser, err := context.StoreTx.GetUserByUsername(user.Username)
 		if err != nil {
 			return NewError(2 /*Unauthorized Access*/)
 		}
 
-		user.HashPassword()
 		if user.PasswordHash != dbuser.PasswordHash {
 			return NewError(2 /*Unauthorized Access*/)
 		}
diff --git a/internal/handlers/transactions.go b/internal/handlers/transactions.go
index 4ec94d1..707d29a 100644
--- a/internal/handlers/transactions.go
+++ b/internal/handlers/transactions.go
@@ -542,7 +542,7 @@ func GetAccountTransactions(tx *db.Tx, user *models.User, accountid int64, sort
 	}
 	atl.TotalTransactions = count
 
-	security, err := GetSecurity(tx, atl.Account.SecurityId, user.UserId)
+	security, err := tx.GetSecurity(atl.Account.SecurityId, user.UserId)
 	if err != nil {
 		return nil, err
 	}
diff --git a/internal/handlers/users.go b/internal/handlers/users.go
index 7225fe5..e9a468d 100644
--- a/internal/handlers/users.go
+++ b/internal/handlers/users.go
@@ -2,9 +2,8 @@ package handlers
 
 import (
 	"errors"
-	"fmt"
 	"github.com/aclindsa/moneygo/internal/models"
-	"github.com/aclindsa/moneygo/internal/store/db"
+	"github.com/aclindsa/moneygo/internal/store"
 	"log"
 	"net/http"
 )
@@ -15,41 +14,21 @@ func (ueu UserExistsError) Error() string {
 	return "User exists"
 }
 
-func GetUser(tx *db.Tx, userid int64) (*models.User, error) {
-	var u models.User
-
-	err := tx.SelectOne(&u, "SELECT * from users where UserId=?", userid)
-	if err != nil {
-		return nil, err
-	}
-	return &u, nil
-}
-
-func GetUserByUsername(tx *db.Tx, username string) (*models.User, error) {
-	var u models.User
-
-	err := tx.SelectOne(&u, "SELECT * from users where Username=?", username)
-	if err != nil {
-		return nil, err
-	}
-	return &u, nil
-}
-
-func InsertUser(tx *db.Tx, u *models.User) error {
+func InsertUser(tx store.Tx, u *models.User) error {
 	security_template := FindCurrencyTemplate(u.DefaultCurrency)
 	if security_template == nil {
 		return errors.New("Invalid ISO4217 Default Currency")
 	}
 
-	existing, err := tx.SelectInt("SELECT count(*) from users where Username=?", u.Username)
+	exists, err := tx.UsernameExists(u.Username)
 	if err != nil {
 		return err
 	}
-	if existing > 0 {
+	if exists {
 		return UserExistsError{}
 	}
 
-	err = tx.Insert(u)
+	err = tx.InsertUser(u)
 	if err != nil {
 		return err
 	}
@@ -59,33 +38,31 @@ func InsertUser(tx *db.Tx, u *models.User) error {
 	security = *security_template
 	security.UserId = u.UserId
 
-	err = InsertSecurity(tx, &security)
+	err = tx.InsertSecurity(&security)
 	if err != nil {
 		return err
 	}
 
 	// Update the user's DefaultCurrency to our new SecurityId
 	u.DefaultCurrency = security.SecurityId
-	count, err := tx.Update(u)
+	err = tx.UpdateUser(u)
 	if err != nil {
 		return err
-	} else if count != 1 {
-		return errors.New("Would have updated more than one user")
 	}
 
 	return nil
 }
 
-func GetUserFromSession(tx *db.Tx, r *http.Request) (*models.User, error) {
+func GetUserFromSession(tx store.Tx, r *http.Request) (*models.User, error) {
 	s, err := GetSession(tx, r)
 	if err != nil {
 		return nil, err
 	}
-	return GetUser(tx, s.UserId)
+	return tx.GetUser(s.UserId)
 }
 
-func UpdateUser(tx *db.Tx, u *models.User) error {
-	security, err := GetSecurity(tx, u.DefaultCurrency, u.UserId)
+func UpdateUser(tx store.Tx, u *models.User) error {
+	security, err := tx.GetSecurity(u.DefaultCurrency, u.UserId)
 	if err != nil {
 		return err
 	} else if security.UserId != u.UserId || security.SecurityId != u.DefaultCurrency {
@@ -94,49 +71,7 @@ func UpdateUser(tx *db.Tx, u *models.User) error {
 		return errors.New("New DefaultCurrency security is not a currency")
 	}
 
-	count, err := tx.Update(u)
-	if err != nil {
-		return err
-	} else if count != 1 {
-		return errors.New("Would have updated more than one user")
-	}
-
-	return nil
-}
-
-func DeleteUser(tx *db.Tx, u *models.User) error {
-	count, err := tx.Delete(u)
-	if err != nil {
-		return err
-	}
-	if count != 1 {
-		return fmt.Errorf("No user to delete")
-	}
-	_, err = tx.Exec("DELETE FROM prices WHERE prices.SecurityId IN (SELECT securities.SecurityId FROM securities WHERE securities.UserId=?)", u.UserId)
-	if err != nil {
-		return err
-	}
-	_, err = tx.Exec("DELETE FROM splits WHERE splits.TransactionId IN (SELECT transactions.TransactionId FROM transactions WHERE transactions.UserId=?)", u.UserId)
-	if err != nil {
-		return err
-	}
-	_, err = tx.Exec("DELETE FROM transactions WHERE transactions.UserId=?", u.UserId)
-	if err != nil {
-		return err
-	}
-	_, err = tx.Exec("DELETE FROM securities WHERE securities.UserId=?", u.UserId)
-	if err != nil {
-		return err
-	}
-	_, err = tx.Exec("DELETE FROM accounts WHERE accounts.UserId=?", u.UserId)
-	if err != nil {
-		return err
-	}
-	_, err = tx.Exec("DELETE FROM reports WHERE reports.UserId=?", u.UserId)
-	if err != nil {
-		return err
-	}
-	_, err = tx.Exec("DELETE FROM sessions WHERE sessions.UserId=?", u.UserId)
+	err = tx.UpdateUser(u)
 	if err != nil {
 		return err
 	}
@@ -205,7 +140,7 @@ func UserHandler(r *http.Request, context *Context) ResponseWriterWriter {
 
 			return user
 		} else if r.Method == "DELETE" {
-			err := DeleteUser(context.Tx, user)
+			err := context.StoreTx.DeleteUser(user)
 			if err != nil {
 				log.Print(err)
 				return NewError(999 /*Internal Error*/)
diff --git a/internal/store/db/securities.go b/internal/store/db/securities.go
new file mode 100644
index 0000000..0acba29
--- /dev/null
+++ b/internal/store/db/securities.go
@@ -0,0 +1,95 @@
+package db
+
+import (
+	"fmt"
+	"github.com/aclindsa/moneygo/internal/models"
+)
+
+type SecurityInUseError struct {
+	message string
+}
+
+func (e SecurityInUseError) Error() string {
+	return e.message
+}
+
+func (tx *Tx) GetSecurity(securityid int64, userid int64) (*models.Security, error) {
+	var s models.Security
+
+	err := tx.SelectOne(&s, "SELECT * from securities where UserId=? AND SecurityId=?", userid, securityid)
+	if err != nil {
+		return nil, err
+	}
+	return &s, nil
+}
+
+func (tx *Tx) GetSecurities(userid int64) (*[]*models.Security, error) {
+	var securities []*models.Security
+
+	_, err := tx.Select(&securities, "SELECT * from securities where UserId=?", userid)
+	if err != nil {
+		return nil, err
+	}
+	return &securities, nil
+}
+
+func (tx *Tx) FindMatchingSecurities(userid int64, security *models.Security) (*[]*models.Security, error) {
+	var securities []*models.Security
+
+	_, err := tx.Select(&securities, "SELECT * from securities where UserId=? AND Type=? AND AlternateId=? AND Preciseness=?", userid, security.Type, security.AlternateId, security.Precision)
+	if err != nil {
+		return nil, err
+	}
+	return &securities, nil
+}
+
+func (tx *Tx) InsertSecurity(s *models.Security) error {
+	err := tx.Insert(s)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (tx *Tx) UpdateSecurity(security *models.Security) error {
+	count, err := tx.Update(security)
+	if err != nil {
+		return err
+	}
+	if count != 1 {
+		return fmt.Errorf("Expected to update 1 security, was going to update %d", count)
+	}
+	return nil
+}
+
+func (tx *Tx) DeleteSecurity(s *models.Security) error {
+	// First, ensure no accounts are using this security
+	accounts, err := tx.SelectInt("SELECT count(*) from accounts where UserId=? and SecurityId=?", s.UserId, s.SecurityId)
+
+	if accounts != 0 {
+		return SecurityInUseError{"One or more accounts still use this security"}
+	}
+
+	user, err := tx.GetUser(s.UserId)
+	if err != nil {
+		return err
+	} else if user.DefaultCurrency == s.SecurityId {
+		return SecurityInUseError{"Cannot delete security which is user's default currency"}
+	}
+
+	// Remove all prices involving this security (either of this security, or
+	// using it as a currency)
+	_, err = tx.Exec("DELETE FROM prices WHERE SecurityId=? OR CurrencyId=?", s.SecurityId, s.SecurityId)
+	if err != nil {
+		return err
+	}
+
+	count, err := tx.Delete(s)
+	if err != nil {
+		return err
+	}
+	if count != 1 {
+		return fmt.Errorf("Expected to delete 1 security, was going to delete %d", count)
+	}
+	return nil
+}
diff --git a/internal/store/db/sessions.go b/internal/store/db/sessions.go
index 671c55a..57a5ad5 100644
--- a/internal/store/db/sessions.go
+++ b/internal/store/db/sessions.go
@@ -31,6 +31,12 @@ func (tx *Tx) SessionExists(secret string) (bool, error) {
 }
 
 func (tx *Tx) DeleteSession(session *models.Session) error {
-	_, err := tx.Delete(session)
-	return err
+	count, err := tx.Delete(session)
+	if err != nil {
+		return err
+	}
+	if count != 1 {
+		return fmt.Errorf("Expected to delete 1 user, was going to delete %d", count)
+	}
+	return nil
 }
diff --git a/internal/store/db/users.go b/internal/store/db/users.go
new file mode 100644
index 0000000..2a44b23
--- /dev/null
+++ b/internal/store/db/users.go
@@ -0,0 +1,86 @@
+package db
+
+import (
+	"fmt"
+	"github.com/aclindsa/moneygo/internal/models"
+)
+
+func (tx *Tx) UsernameExists(username string) (bool, error) {
+	existing, err := tx.SelectInt("SELECT count(*) from users where Username=?", username)
+	return existing != 0, err
+}
+
+func (tx *Tx) InsertUser(user *models.User) error {
+	return tx.Insert(user)
+}
+
+func (tx *Tx) GetUser(userid int64) (*models.User, error) {
+	var u models.User
+
+	err := tx.SelectOne(&u, "SELECT * from users where UserId=?", userid)
+	if err != nil {
+		return nil, err
+	}
+	return &u, nil
+}
+
+func (tx *Tx) GetUserByUsername(username string) (*models.User, error) {
+	var u models.User
+
+	err := tx.SelectOne(&u, "SELECT * from users where Username=?", username)
+	if err != nil {
+		return nil, err
+	}
+	return &u, nil
+}
+
+func (tx *Tx) UpdateUser(user *models.User) error {
+	count, err := tx.Update(user)
+	if err != nil {
+		return err
+	}
+	if count != 1 {
+		return fmt.Errorf("Expected to update 1 user, was going to update %d", count)
+	}
+	return nil
+}
+
+func (tx *Tx) DeleteUser(user *models.User) error {
+	count, err := tx.Delete(user)
+	if err != nil {
+		return err
+	}
+	if count != 1 {
+		return fmt.Errorf("Expected to delete 1 user, was going to delete %d", count)
+	}
+	_, err = tx.Exec("DELETE FROM prices WHERE prices.SecurityId IN (SELECT securities.SecurityId FROM securities WHERE securities.UserId=?)", user.UserId)
+	if err != nil {
+		return err
+	}
+	_, err = tx.Exec("DELETE FROM splits WHERE splits.TransactionId IN (SELECT transactions.TransactionId FROM transactions WHERE transactions.UserId=?)", user.UserId)
+	if err != nil {
+		return err
+	}
+	_, err = tx.Exec("DELETE FROM transactions WHERE transactions.UserId=?", user.UserId)
+	if err != nil {
+		return err
+	}
+	_, err = tx.Exec("DELETE FROM securities WHERE securities.UserId=?", user.UserId)
+	if err != nil {
+		return err
+	}
+	_, err = tx.Exec("DELETE FROM accounts WHERE accounts.UserId=?", user.UserId)
+	if err != nil {
+		return err
+	}
+	_, err = tx.Exec("DELETE FROM reports WHERE reports.UserId=?", user.UserId)
+	if err != nil {
+		return err
+	}
+	_, err = tx.Exec("DELETE FROM sessions WHERE sessions.UserId=?", user.UserId)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
diff --git a/internal/store/store.go b/internal/store/store.go
index 9823236..86d6c66 100644
--- a/internal/store/store.go
+++ b/internal/store/store.go
@@ -5,17 +5,37 @@ import (
 )
 
 type SessionStore interface {
+	SessionExists(secret string) (bool, error)
 	InsertSession(session *models.Session) error
 	GetSession(secret string) (*models.Session, error)
-	SessionExists(secret string) (bool, error)
 	DeleteSession(session *models.Session) error
 }
 
+type UserStore interface {
+	UsernameExists(username string) (bool, error)
+	InsertUser(user *models.User) error
+	GetUser(userid int64) (*models.User, error)
+	GetUserByUsername(username string) (*models.User, error)
+	UpdateUser(user *models.User) error
+	DeleteUser(user *models.User) error
+}
+
+type SecurityStore interface {
+	InsertSecurity(security *models.Security) error
+	GetSecurity(securityid int64, userid int64) (*models.Security, error)
+	GetSecurities(userid int64) (*[]*models.Security, error)
+	FindMatchingSecurities(userid int64, security *models.Security) (*[]*models.Security, error)
+	UpdateSecurity(security *models.Security) error
+	DeleteSecurity(security *models.Security) error
+}
+
 type Tx interface {
 	Commit() error
 	Rollback() error
 
 	SessionStore
+	UserStore
+	SecurityStore
 }
 
 type Store interface {