diff --git a/api/api.go b/api/api.go
index c5156c2..398db4b 100644
--- a/api/api.go
+++ b/api/api.go
@@ -2,6 +2,7 @@ package api
 
 import (
     "context"
+    "errors"
     "fmt"
     "net/http"
     "os"
@@ -172,7 +173,7 @@ func getSession(app *model.AppState, r *http.Request) (*model.Session, error) {
     // check cookies first
     sessionCookie, err := r.Cookie(model.COOKIE_TOKEN)
     if err != nil && err != http.ErrNoCookie {
-        return nil, fmt.Errorf("Failed to retrieve session cookie: %v\n", err)
+        return nil, errors.New(fmt.Sprintf("Failed to retrieve session cookie: %v\n", err))
     }
     if sessionCookie != nil {
         token = sessionCookie.Value
@@ -187,7 +188,7 @@ func getSession(app *model.AppState, r *http.Request) (*model.Session, error) {
     session, err := controller.GetSession(app.DB, token)
 
     if err != nil && !strings.Contains(err.Error(), "no rows") {
-        return nil, fmt.Errorf("Failed to retrieve session: %v\n", err)
+        return nil, errors.New(fmt.Sprintf("Failed to retrieve session: %v\n", err))
     }
 
     if session != nil {
diff --git a/api/uploads.go b/api/uploads.go
index 3c3c58a..4678f22 100644
--- a/api/uploads.go
+++ b/api/uploads.go
@@ -50,7 +50,7 @@ func HandleImageUpload(app *model.AppState, data *string, directory string, file
         return "", nil
     }
 
-    app.Log.Info(log.TYPE_FILES, "\"%s\" created.", imagePath)
+    app.Log.Info(log.TYPE_FILES, "\"%s/%s.%s\" created.", directory, filename, ext)
 
     return filename, nil
 }
diff --git a/controller/migrator.go b/controller/migrator.go
index 1a70e62..4b99b9c 100644
--- a/controller/migrator.go
+++ b/controller/migrator.go
@@ -1,15 +1,14 @@
 package controller
 
 import (
-	"embed"
-	"fmt"
-	"os"
-	"time"
+    "fmt"
+    "os"
+    "time"
 
-	"github.com/jmoiron/sqlx"
+    "github.com/jmoiron/sqlx"
 )
 
-const DB_VERSION int = 5
+const DB_VERSION int = 4
 
 func CheckDBVersionAndMigrate(db *sqlx.DB) {
     db.MustExec("CREATE SCHEMA IF NOT EXISTS arimelody")
@@ -50,23 +49,16 @@ func CheckDBVersionAndMigrate(db *sqlx.DB) {
             ApplyMigration(db, "003-fail-lock")
             oldDBVersion = 4
 
-        case 4:
-            ApplyMigration(db, "004-test")
-            oldDBVersion = 5
-
         }
     }
 
     fmt.Printf("Database schema up to date.\n")
 }
 
-//go:embed "schema-migration"
-var schemaFS embed.FS
-
 func ApplyMigration(db *sqlx.DB, scriptFile string) {
     fmt.Printf("Applying schema migration %s...\n", scriptFile)
 
-    bytes, err := schemaFS.ReadFile("schema-migration/" + scriptFile + ".sql")
+    bytes, err := os.ReadFile("schema-migration/" + scriptFile + ".sql")
     if err != nil {
         fmt.Fprintf(os.Stderr, "FATAL: Failed to open schema file \"%s\": %v\n", scriptFile, err)
         os.Exit(1)
diff --git a/controller/qr.go b/controller/qr.go
index 21ed3e6..dd08637 100644
--- a/controller/qr.go
+++ b/controller/qr.go
@@ -2,8 +2,8 @@ package controller
 
 import (
     "encoding/base64"
-    // "image"
-    // "image/color"
+    "image"
+    "image/color"
 
     "github.com/skip2/go-qrcode"
 )
@@ -18,35 +18,36 @@ func GenerateQRCode(data string) (string, error) {
 }
 
 // vvv DEPRECATED vvv
-// const margin = 4
-//
-// type QRCodeECCLevel int64
-// const (
-//     LOW QRCodeECCLevel = iota
-//     MEDIUM
-//     QUARTILE
-//     HIGH
-// )
-//
-// func drawLargeAlignmentSquare(x int, y int, img *image.Gray) {
-//     for yi := range 7 {
-//         for xi := range 7 {
-//             if (xi == 0 || xi == 6) || (yi == 0 || yi == 6) {
-//                 img.Set(x + xi, y + yi, color.Black)
-//             } else if (xi > 1 && xi < 5) && (yi > 1 && yi < 5) {
-//                 img.Set(x + xi, y + yi, color.Black)
-//             }
-//         }
-//     }
-// }
-//
-// func drawSmallAlignmentSquare(x int, y int, img *image.Gray) {
-//     for yi := range 5 {
-//         for xi := range 5 {
-//             if (xi == 0 || xi == 4) || (yi == 0 || yi == 4) {
-//                 img.Set(x + xi, y + yi, color.Black)
-//             }
-//         }
-//     }
-//     img.Set(x + 2, y + 2, color.Black)
-// }
+
+const margin = 4
+
+type QRCodeECCLevel int64
+const (
+    LOW QRCodeECCLevel = iota
+    MEDIUM
+    QUARTILE
+    HIGH
+)
+
+func drawLargeAlignmentSquare(x int, y int, img *image.Gray) {
+    for yi := range 7 {
+        for xi := range 7 {
+            if (xi == 0 || xi == 6) || (yi == 0 || yi == 6) {
+                img.Set(x + xi, y + yi, color.Black)
+            } else if (xi > 1 && xi < 5) && (yi > 1 && yi < 5) {
+                img.Set(x + xi, y + yi, color.Black)
+            }
+        }
+    }
+}
+
+func drawSmallAlignmentSquare(x int, y int, img *image.Gray) {
+    for yi := range 5 {
+        for xi := range 5 {
+            if (xi == 0 || xi == 4) || (yi == 0 || yi == 4) {
+                img.Set(x + xi, y + yi, color.Black)
+            }
+        }
+    }
+    img.Set(x + 2, y + 2, color.Black)
+}
diff --git a/controller/release.go b/controller/release.go
index afd09fb..3dcad26 100644
--- a/controller/release.go
+++ b/controller/release.go
@@ -1,6 +1,7 @@
 package controller
 
 import (
+    "errors"
     "fmt"
 
     "arimelody-web/model"
@@ -20,7 +21,7 @@ func GetRelease(db *sqlx.DB, id string, full bool) (*model.Release, error) {
         // get credits
         credits, err := GetReleaseCredits(db, id)
         if err != nil {
-            return nil, fmt.Errorf("Credits: %s", err)
+            return nil, errors.New(fmt.Sprintf("Credits: %s", err))
         }
         for _, credit := range credits {
             release.Credits = append(release.Credits, credit)
@@ -29,7 +30,7 @@ func GetRelease(db *sqlx.DB, id string, full bool) (*model.Release, error) {
         // get tracks
         tracks, err := GetReleaseTracks(db, id)
         if err != nil {
-            return nil, fmt.Errorf("Tracks: %s", err)
+            return nil, errors.New(fmt.Sprintf("Tracks: %s", err))
         }
         for _, track := range tracks {
             release.Tracks = append(release.Tracks, track)
@@ -38,7 +39,7 @@ func GetRelease(db *sqlx.DB, id string, full bool) (*model.Release, error) {
         // get links
         links, err := GetReleaseLinks(db, id)
         if err != nil {
-            return nil, fmt.Errorf("Links: %s", err)
+            return nil, errors.New(fmt.Sprintf("Links: %s", err))
         }
         for _, link := range links {
             release.Links = append(release.Links, link)
@@ -70,7 +71,7 @@ func GetAllReleases(db *sqlx.DB, onlyVisible bool, limit int, full bool) ([]*mod
         // get credits
         credits, err := GetReleaseCredits(db, release.ID)
         if err != nil {
-            return nil, fmt.Errorf("Credits: %s", err)
+            return nil, errors.New(fmt.Sprintf("Credits: %s", err))
         }
         for _, credit := range credits {
             release.Credits = append(release.Credits, credit)
@@ -80,7 +81,7 @@ func GetAllReleases(db *sqlx.DB, onlyVisible bool, limit int, full bool) ([]*mod
             // get tracks
             tracks, err := GetReleaseTracks(db, release.ID)
             if err != nil {
-                return nil, fmt.Errorf("Tracks: %s", err)
+                return nil, errors.New(fmt.Sprintf("Tracks: %s", err))
             }
             for _, track := range tracks {
                 release.Tracks = append(release.Tracks, track)
@@ -89,7 +90,7 @@ func GetAllReleases(db *sqlx.DB, onlyVisible bool, limit int, full bool) ([]*mod
             // get links
             links, err := GetReleaseLinks(db, release.ID)
             if err != nil {
-                return nil, fmt.Errorf("Links: %s", err)
+                return nil, errors.New(fmt.Sprintf("Links: %s", err))
             }
             for _, link := range links {
                 release.Links = append(release.Links, link)
diff --git a/controller/schema-migration/004-test.sql b/controller/schema-migration/004-test.sql
deleted file mode 100644
index 3733de2..0000000
--- a/controller/schema-migration/004-test.sql
+++ /dev/null
@@ -1 +0,0 @@
-INSERT INTO arimelody.auditlog (level, type, content) VALUES (0, "test", "this is a db schema migration test!");
diff --git a/controller/session.go b/controller/session.go
index dfae551..5028789 100644
--- a/controller/session.go
+++ b/controller/session.go
@@ -2,6 +2,7 @@ package controller
 
 import (
     "database/sql"
+    "errors"
     "fmt"
     "net/http"
     "strings"
@@ -18,7 +19,7 @@ const TOKEN_LEN = 64
 func GetSessionFromRequest(app *model.AppState, r *http.Request) (*model.Session, error) {
     sessionCookie, err := r.Cookie(model.COOKIE_TOKEN)
     if err != nil && err != http.ErrNoCookie {
-        return nil, fmt.Errorf("Failed to retrieve session cookie: %v", err)
+        return nil, errors.New(fmt.Sprintf("Failed to retrieve session cookie: %v", err))
     }
 
     var session *model.Session
@@ -28,7 +29,7 @@ func GetSessionFromRequest(app *model.AppState, r *http.Request) (*model.Session
         session, err = GetSession(app.DB, sessionCookie.Value)
 
         if err != nil && !strings.Contains(err.Error(), "no rows") {
-            return nil, fmt.Errorf("Failed to retrieve session: %v", err)
+            return nil, errors.New(fmt.Sprintf("Failed to retrieve session: %v", err))
         }
 
         if session != nil {
diff --git a/controller/schema-migration/000-init.sql b/schema-migration/000-init.sql
similarity index 100%
rename from controller/schema-migration/000-init.sql
rename to schema-migration/000-init.sql
diff --git a/controller/schema-migration/001-pre-versioning.sql b/schema-migration/001-pre-versioning.sql
similarity index 100%
rename from controller/schema-migration/001-pre-versioning.sql
rename to schema-migration/001-pre-versioning.sql
diff --git a/controller/schema-migration/002-audit-logs.sql b/schema-migration/002-audit-logs.sql
similarity index 100%
rename from controller/schema-migration/002-audit-logs.sql
rename to schema-migration/002-audit-logs.sql
diff --git a/controller/schema-migration/003-fail-lock.sql b/schema-migration/003-fail-lock.sql
similarity index 100%
rename from controller/schema-migration/003-fail-lock.sql
rename to schema-migration/003-fail-lock.sql