Move user properties (like session keys) to their own table

tests/mock_user_props_repo.go

@@ -0,0 +1,60 @@
+package tests
+
+import "github.com/navidrome/navidrome/model"
+
+type MockedUserPropsRepo struct {
+	model.UserPropsRepository
+	UserID string
+	data   map[string]string
+	err    error
+}
+
+func (p *MockedUserPropsRepo) init() {
+	if p.data == nil {
+		p.data = make(map[string]string)
+	}
+}
+
+func (p *MockedUserPropsRepo) Put(key string, value string) error {
+	if p.err != nil {
+		return p.err
+	}
+	p.init()
+	p.data[p.UserID+"_"+key] = value
+	return nil
+}
+
+func (p *MockedUserPropsRepo) Get(key string) (string, error) {
+	if p.err != nil {
+		return "", p.err
+	}
+	p.init()
+	if v, ok := p.data[p.UserID+"_"+key]; ok {
+		return v, nil
+	}
+	return "", model.ErrNotFound
+}
+
+func (p *MockedUserPropsRepo) Delete(key string) error {
+	if p.err != nil {
+		return p.err
+	}
+	p.init()
+	if _, ok := p.data[p.UserID+"_"+key]; ok {
+		delete(p.data, p.UserID+"_"+key)
+		return nil
+	}
+	return model.ErrNotFound
+}
+
+func (p *MockedUserPropsRepo) DefaultGet(key string, defaultValue string) (string, error) {
+	if p.err != nil {
+		return "", p.err
+	}
+	p.init()
+	v, err := p.Get(p.UserID + "_" + key)
+	if err != nil {
+		return defaultValue, nil
+	}
+	return v, nil
+}