fix(timezones): move from utc offsets to timezones

This fixed various issues related to calculating streaks, etc. Now we
appropriately handle time as it was, vs as it is relative to an offset.

database/models.go

@@ -99,12 +99,12 @@ type Setting struct {
 }
 
 type User struct {
-	ID         string  `json:"id"`
-	Pass       *string `json:"-"`
-	AuthHash   *string `json:"auth_hash"`
-	Admin      bool    `json:"-"`
-	TimeOffset *string `json:"time_offset"`
-	CreatedAt  string  `json:"created_at"`
+	ID        string  `json:"id"`
+	Pass      *string `json:"-"`
+	AuthHash  *string `json:"auth_hash"`
+	Admin     bool    `json:"-"`
+	Timezone  *string `json:"timezone"`
+	CreatedAt string  `json:"created_at"`
 }
 
 type UserStreak struct {
@@ -117,34 +117,3 @@ type UserStreak struct {
 	CurrentStreakStartDate string `json:"current_streak_start_date"`
 	CurrentStreakEndDate   string `json:"current_streak_end_date"`
 }
-
-type ViewDocumentUserStatistic struct {
-	DocumentID         string      `json:"document_id"`
-	UserID             string      `json:"user_id"`
-	Percentage         float64     `json:"percentage"`
-	LastRead           interface{} `json:"last_read"`
-	ReadPercentage     *float64    `json:"read_percentage"`
-	TotalTimeSeconds   *float64    `json:"total_time_seconds"`
-	TotalWordsRead     interface{} `json:"total_words_read"`
-	TotalWpm           int64       `json:"total_wpm"`
-	YearlyTimeSeconds  *float64    `json:"yearly_time_seconds"`
-	YearlyWordsRead    interface{} `json:"yearly_words_read"`
-	YearlyWpm          interface{} `json:"yearly_wpm"`
-	MonthlyTimeSeconds *float64    `json:"monthly_time_seconds"`
-	MonthlyWordsRead   interface{} `json:"monthly_words_read"`
-	MonthlyWpm         interface{} `json:"monthly_wpm"`
-	WeeklyTimeSeconds  *float64    `json:"weekly_time_seconds"`
-	WeeklyWordsRead    interface{} `json:"weekly_words_read"`
-	WeeklyWpm          interface{} `json:"weekly_wpm"`
-}
-
-type ViewUserStreak struct {
-	UserID                 string      `json:"user_id"`
-	Window                 string      `json:"window"`
-	MaxStreak              interface{} `json:"max_streak"`
-	MaxStreakStartDate     interface{} `json:"max_streak_start_date"`
-	MaxStreakEndDate       interface{} `json:"max_streak_end_date"`
-	CurrentStreak          interface{} `json:"current_streak"`
-	CurrentStreakStartDate interface{} `json:"current_streak_start_date"`
-	CurrentStreakEndDate   interface{} `json:"current_streak_end_date"`
-}