[Amazfit] GreatApo:
You can find them by digging the apps included in the watch. Here is my collection: (don't expect everything to work)

// Contents
adb shell content query --uri content://com.huami.watch.health.heartrate/allday_heartrate_history/
adb shell content query --uri content://com.huami.watch.health/sleep_data
adb shell content query --uri content://com.huami.watch.health/sleep_data_batch
adb shell content query --uri content://com.huami.watch.health/daily_motion
adb shell content query --uri content://com.huami.watch.health/daily_motion_batch
adb shell content query --uri content://com.huami.watch.health.heartdata
adb shell content query --uri content://com.huami.watch.health/heart_rate_record
adb shell content query --uri content://com.huami.watch.health/allday_heart_rate
adb shell content query --uri content://com.huami.watch.health.historydata
adb shell content query --uri content://com.huami.watch.sport.provider/sport_summary_data_info
adb shell content query --uri content://settings/secure/measurement
adb shell content query --uri content://settings/secure/sport_today_distance
adb shell content query --uri content://settings/secure/sport_total_distance

// ALARM
adb shell content query --uri content://com.huami.watch.deskclock.countdown/news
adb shell content query --uri content://com.huami.watch.deskclock.countdown/status

// NEW WEAR SPORT
content://com.huami.watch.sport.provider/today_dis
content://com.huami.watch.sport.provider/sport_heart_count
content://com.huami.watch.sport.provider/sport_summary_data_info
content://com.huami.watch.sport.provider/sport_sort_info
content://com.huami.watch.sport.provider/sport_statistics
content://com.huami.watch.sport.provider/total_dis
// com.huami.watch.newsport.trackcollect has more
adb shell content query --uri content://com.huami.watch.location.provider/query_location_info/all

// Reports
adb shell content query --uri content://com.huami.watch.reports.database.DataReportProvider/weeklysports
adb shell content query --uri content://com.huami.watch.reports.database.DataReportProvider/weeklysports/#
adb shell content query --uri content://com.huami.watch.reports.database.DataReportProvider/daily_reports
adb shell content query --uri content://com.huami.watch.reports.database.DataReportProvider/daily_reports/#

// NOT WORKING
adb shell content query --uri content://com.google.android.wearable.provider.calendar
public static final Uri ALL_SETTINGS_URI = new Builder().scheme("content").authority("com.huami.wearable.settings").path("settings").build();
public static final Uri BUG_REPORT_URI = new Builder().scheme("content").authority("com.huami.wearable.settings").path("bug_report").build();
public static final Uri DEEP_AMBIENT_MODE_URI = new Builder().scheme("content").authority("com.huami.wearable.settings").path("deep_ambient_mode").build();
public static final Uri DISPLAY_SHAPE_URI = new Builder().scheme("content").authority("com.huami.wearable.settings").path("shape").build();
public static final Uri RETAIL_MODE_URI = new Builder().scheme("content").authority("com.huami.wearable.settings").path("retail").build();
public static final Uri SUNLIGHT_MODE_URI = new Builder().scheme("content").authority("com.huami.wearable.settings").path("sunlight_mode").build();
public static final Uri THEATER_MODE_URI = new Builder().scheme("content").authority("com.huami.wearable.settings").path("theater_mode").build();

// Data
adb shell settings get global slpt_refresh_in_sec
adb shell settings get system slpt_refresh_in_sec

adb shell content query --uri content://settings/global
adb shell content query --uri content://settings/system
adb shell content query --uri content://com.huami.watch.companion.settings
adb shell content query --uri content://settings/secure
adb shell content query --uri content://com.huami.watch.setup.usersettings (needs permissions)
adb shell content query --uri content://com.huami.watch.wearubc.UbcContentProvider/ubc_info

adb shell settings get system time_12_24
adb shell settings get system com.huami.watch.watchface.extra.STATUSBAR_POSITION_X

adb shell settings get system screen_off_timeout
adb shell settings get system com.huami.watch.key.DEVICE_BOND_TYPE

// TO-DO
adb shell settings get system wifi_on
adb shell settings get system airplane_mode_on
adb shell settings get system com.huami.watch.extra.DEVICE_CONNECTION_STATUS
adb shell settings get system sys.state.powerlow

// Calendar
adb shell content query --uri CalendarContract.Calendars.CONTENT_URI

// Widgets
adb shell settings get system springboard_widget_order_in
adb shell settings get system springboard_widget_order_out