Nullability Annotations to Java Classes - DB & Table

[ParaskP7]

Parent #18904

This issue is about adding missing nullability annotations (@Nullable & @NonNull) to as many Java-related DB & Table classes as possible, including fields, arguments, parameters, and return values.

FYI: As a reference, few examples of such classes are WordPressDB.java, PeopleTable.java and ReaderBlogTable.java.

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DB

Tasks

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1. WordPressDB.java
2. ReaderDatabase.java
3. SQLTable.java (unused)

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Table

Tasks (notifications)

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1. NotificationsTable.java

Tasks (publicize)

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1. PublicizeTable.java

Tasks (reader)

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1. ReaderBlockedBlogTable.java
2. ReaderBlogTable.java
3. ReaderCommentTable.java
4. ReaderLikeTable.java
5. ReaderPostTable.java
6. ReaderSearchTable.java
7. ReaderTagTable.java
8. ReaderThumbnailTable.java
9. ReaderUserTable.java

Tasks (site)

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1. SiteSettingsTable.java

Tasks (other)

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1. BlockedAuthorTable.java
2. PeopleTable.java
3. UserSuggestionTable.java

[peril-wordpress-mobile]

	Fails
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