diff --git a/src/main/java/ai/elimu/web/servlet/CustomDispatcherServlet.java b/src/main/java/ai/elimu/web/servlet/CustomDispatcherServlet.java
index 4dc5fe9d8..136205c04 100644
--- a/src/main/java/ai/elimu/web/servlet/CustomDispatcherServlet.java
+++ b/src/main/java/ai/elimu/web/servlet/CustomDispatcherServlet.java
@@ -1,5 +1,6 @@
 package ai.elimu.web.servlet;
 
+import ai.elimu.entity.BaseEntity;
 import ai.elimu.model.v2.enums.Environment;
 import ai.elimu.model.v2.enums.Language;
 import ai.elimu.util.ConfigHelper;
@@ -81,7 +82,7 @@ private void createJpaSchemaExport() {
         // Scan for classes annotated as JPA @Entity
         ClassPathScanningCandidateComponentProvider entityScanner = new ClassPathScanningCandidateComponentProvider(true);
         entityScanner.addIncludeFilter(new AnnotationTypeFilter(Entity.class));
-        for (BeanDefinition beanDefinition : entityScanner.findCandidateComponents("ai.elimu.model")) {
+        for (BeanDefinition beanDefinition : entityScanner.findCandidateComponents(BaseEntity.class.getPackageName())) {
             logger.info("beanDefinition.getBeanClassName(): " + beanDefinition.getBeanClassName());
             try {
                 Class<?> annotatedClass = Class.forName(beanDefinition.getBeanClassName());
diff --git a/src/main/resources/META-INF/jpa-schema-export.sql b/src/main/resources/META-INF/jpa-schema-export.sql
index e69de29bb..d21e5fb72 100644
--- a/src/main/resources/META-INF/jpa-schema-export.sql
+++ b/src/main/resources/META-INF/jpa-schema-export.sql
@@ -0,0 +1,1131 @@
+
+    drop table if exists Application CASCADE ;
+
+    drop table if exists Application_literacySkills CASCADE ;
+
+    drop table if exists Application_numeracySkills CASCADE ;
+
+    drop table if exists ApplicationVersion CASCADE ;
+
+    drop table if exists Audio CASCADE ;
+
+    drop table if exists Audio_Letter CASCADE ;
+
+    drop table if exists Audio_literacySkills CASCADE ;
+
+    drop table if exists Audio_Number CASCADE ;
+
+    drop table if exists Audio_numeracySkills CASCADE ;
+
+    drop table if exists Audio_Word CASCADE ;
+
+    drop table if exists AudioContributionEvent CASCADE ;
+
+    drop table if exists AudioPeerReviewEvent CASCADE ;
+
+    drop table if exists Contributor CASCADE ;
+
+    drop table if exists Contributor_roles CASCADE ;
+
+    drop table if exists DbMigration CASCADE ;
+
+    drop table if exists Device CASCADE ;
+
+    drop table if exists Emoji CASCADE ;
+
+    drop table if exists Emoji_Word CASCADE ;
+
+    drop table if exists Image CASCADE ;
+
+    drop table if exists Image_Letter CASCADE ;
+
+    drop table if exists Image_literacySkills CASCADE ;
+
+    drop table if exists Image_Number CASCADE ;
+
+    drop table if exists Image_numeracySkills CASCADE ;
+
+    drop table if exists Image_Word CASCADE ;
+
+    drop table if exists ImageContributionEvent CASCADE ;
+
+    drop table if exists Letter CASCADE ;
+
+    drop table if exists LetterContributionEvent CASCADE ;
+
+    drop table if exists LetterLearningEvent CASCADE ;
+
+    drop table if exists LetterSoundCorrespondence CASCADE ;
+
+    drop table if exists LetterSoundCorrespondence_Letter CASCADE ;
+
+    drop table if exists LetterSoundCorrespondence_Sound CASCADE ;
+
+    drop table if exists LetterSoundCorrespondenceContributionEvent CASCADE ;
+
+    drop table if exists LetterSoundCorrespondencePeerReviewEvent CASCADE ;
+
+    drop table if exists Number CASCADE ;
+
+    drop table if exists Number_Word CASCADE ;
+
+    drop table if exists NumberContributionEvent CASCADE ;
+
+    drop table if exists NumberPeerReviewEvent CASCADE ;
+
+    drop table if exists Sound CASCADE ;
+
+    drop table if exists SoundContributionEvent CASCADE ;
+
+    drop table if exists StoryBook CASCADE ;
+
+    drop table if exists StoryBookChapter CASCADE ;
+
+    drop table if exists StoryBookContributionEvent CASCADE ;
+
+    drop table if exists StoryBookLearningEvent CASCADE ;
+
+    drop table if exists StoryBookParagraph CASCADE ;
+
+    drop table if exists StoryBookParagraph_Word CASCADE ;
+
+    drop table if exists StoryBookPeerReviewEvent CASCADE ;
+
+    drop table if exists Syllable CASCADE ;
+
+    drop table if exists Syllable_Sound CASCADE ;
+
+    drop table if exists Video CASCADE ;
+
+    drop table if exists Video_Letter CASCADE ;
+
+    drop table if exists Video_literacySkills CASCADE ;
+
+    drop table if exists Video_Number CASCADE ;
+
+    drop table if exists Video_numeracySkills CASCADE ;
+
+    drop table if exists Video_Word CASCADE ;
+
+    drop table if exists Word CASCADE ;
+
+    drop table if exists Word_LetterSoundCorrespondence CASCADE ;
+
+    drop table if exists WordContributionEvent CASCADE ;
+
+    drop table if exists WordLearningEvent CASCADE ;
+
+    drop table if exists WordPeerReviewEvent CASCADE ;
+
+    create table Application (
+       id bigint generated by default as identity (start with 1),
+        applicationStatus varchar(255),
+        infrastructural boolean not null,
+        packageName varchar(255),
+        contributor_id bigint,
+        primary key (id)
+    );
+
+    create table Application_literacySkills (
+       Application_id bigint not null,
+        literacySkills varchar(255)
+    );
+
+    create table Application_numeracySkills (
+       Application_id bigint not null,
+        numeracySkills varchar(255)
+    );
+
+    create table ApplicationVersion (
+       id bigint generated by default as identity (start with 1),
+        bytes blob(1073741824),
+        checksumMd5 varchar(255),
+        contentType varchar(255),
+        fileSizeInKb integer,
+        icon blob(512000),
+        label varchar(255),
+        minSdkVersion integer,
+        timeUploaded timestamp,
+        versionCode integer,
+        versionName varchar(255),
+        application_id bigint,
+        contributor_id bigint,
+        primary key (id)
+    );
+
+    create table Audio (
+       id bigint generated by default as identity (start with 1),
+        contentStatus varchar(255),
+        peerReviewStatus varchar(255),
+        revisionNumber integer,
+        timeLastUpdate timestamp,
+        usageCount integer,
+        attributionUrl varchar(1000),
+        contentLicense varchar(255),
+        contentType varchar(255),
+        audioFormat varchar(255),
+        bytes blob(209715200),
+        durationMs bigint,
+        title varchar(255),
+        transcription varchar(255),
+        storyBookParagraph_id bigint,
+        word_id bigint,
+        primary key (id)
+    );
+
+    create table Audio_Letter (
+       Audio_id bigint not null,
+        letters_id bigint not null,
+        primary key (Audio_id, letters_id)
+    );
+
+    create table Audio_literacySkills (
+       Audio_id bigint not null,
+        literacySkills varchar(255)
+    );
+
+    create table Audio_Number (
+       Audio_id bigint not null,
+        numbers_id bigint not null,
+        primary key (Audio_id, numbers_id)
+    );
+
+    create table Audio_numeracySkills (
+       Audio_id bigint not null,
+        numeracySkills varchar(255)
+    );
+
+    create table Audio_Word (
+       Audio_id bigint not null,
+        words_id bigint not null,
+        primary key (Audio_id, words_id)
+    );
+
+    create table AudioContributionEvent (
+       id bigint generated by default as identity (start with 1),
+        comment varchar(1000),
+        platform varchar(255),
+        revisionNumber integer,
+        time timestamp,
+        timeSpentMs bigint,
+        contributor_id bigint,
+        audio_id bigint,
+        primary key (id)
+    );
+
+    create table AudioPeerReviewEvent (
+       id bigint generated by default as identity (start with 1),
+        approved boolean,
+        comment varchar(1000),
+        platform varchar(255),
+        time timestamp,
+        contributor_id bigint,
+        audioContributionEvent_id bigint,
+        primary key (id)
+    );
+
+    create table Contributor (
+       id bigint generated by default as identity (start with 1),
+        email varchar(255),
+        firstName varchar(255),
+        imageUrl varchar(255),
+        lastName varchar(255),
+        motivation varchar(1000),
+        occupation varchar(255),
+        providerIdDiscord varchar(255),
+        providerIdGitHub varchar(255),
+        providerIdGoogle varchar(255),
+        providerIdWeb3 varchar(42),
+        registrationTime timestamp,
+        usernameDiscord varchar(255),
+        usernameGitHub varchar(255),
+        primary key (id)
+    );
+
+    create table Contributor_roles (
+       Contributor_id bigint not null,
+        roles varchar(255)
+    );
+
+    create table DbMigration (
+       id bigint generated by default as identity (start with 1),
+        calendar timestamp,
+        script varchar(10000),
+        version integer,
+        primary key (id)
+    );
+
+    create table Device (
+       id bigint generated by default as identity (start with 1),
+        deviceId varchar(255),
+        deviceManufacturer varchar(255),
+        deviceModel varchar(255),
+        deviceSerial varchar(255),
+        osVersion integer,
+        remoteAddress varchar(255),
+        timeRegistered timestamp,
+        primary key (id)
+    );
+
+    create table Emoji (
+       id bigint generated by default as identity (start with 1),
+        contentStatus varchar(255),
+        peerReviewStatus varchar(255),
+        revisionNumber integer,
+        timeLastUpdate timestamp,
+        usageCount integer,
+        glyph varchar(4),
+        unicodeEmojiVersion double,
+        unicodeVersion double,
+        primary key (id)
+    );
+
+    create table Emoji_Word (
+       Emoji_id bigint not null,
+        words_id bigint not null,
+        primary key (Emoji_id, words_id)
+    );
+
+    create table Image (
+       id bigint generated by default as identity (start with 1),
+        contentStatus varchar(255),
+        peerReviewStatus varchar(255),
+        revisionNumber integer,
+        timeLastUpdate timestamp,
+        usageCount integer,
+        attributionUrl varchar(1000),
+        contentLicense varchar(255),
+        contentType varchar(255),
+        bytes blob(10485760),
+        dominantColor varchar(255),
+        imageFormat varchar(255),
+        title varchar(255),
+        primary key (id)
+    );
+
+    create table Image_Letter (
+       Image_id bigint not null,
+        letters_id bigint not null,
+        primary key (Image_id, letters_id)
+    );
+
+    create table Image_literacySkills (
+       Image_id bigint not null,
+        literacySkills varchar(255)
+    );
+
+    create table Image_Number (
+       Image_id bigint not null,
+        numbers_id bigint not null,
+        primary key (Image_id, numbers_id)
+    );
+
+    create table Image_numeracySkills (
+       Image_id bigint not null,
+        numeracySkills varchar(255)
+    );
+
+    create table Image_Word (
+       Image_id bigint not null,
+        words_id bigint not null,
+        primary key (Image_id, words_id)
+    );
+
+    create table ImageContributionEvent (
+       id bigint generated by default as identity (start with 1),
+        comment varchar(1000),
+        platform varchar(255),
+        revisionNumber integer,
+        time timestamp,
+        timeSpentMs bigint,
+        contributor_id bigint,
+        image_id bigint,
+        primary key (id)
+    );
+
+    create table Letter (
+       id bigint generated by default as identity (start with 1),
+        contentStatus varchar(255),
+        peerReviewStatus varchar(255),
+        revisionNumber integer,
+        timeLastUpdate timestamp,
+        usageCount integer,
+        diacritic boolean not null,
+        text varchar(2),
+        primary key (id)
+    );
+
+    create table LetterContributionEvent (
+       id bigint generated by default as identity (start with 1),
+        comment varchar(1000),
+        platform varchar(255),
+        revisionNumber integer,
+        time timestamp,
+        timeSpentMs bigint,
+        contributor_id bigint,
+        letter_id bigint,
+        primary key (id)
+    );
+
+    create table LetterLearningEvent (
+       id bigint generated by default as identity (start with 1),
+        androidId varchar(255),
+        learningEventType varchar(255),
+        packageName varchar(255),
+        time timestamp,
+        letterText varchar(255),
+        application_id bigint,
+        letter_id bigint,
+        primary key (id)
+    );
+
+    create table LetterSoundCorrespondence (
+       id bigint generated by default as identity (start with 1),
+        contentStatus varchar(255),
+        peerReviewStatus varchar(255),
+        revisionNumber integer,
+        timeLastUpdate timestamp,
+        usageCount integer,
+        primary key (id)
+    );
+
+    create table LetterSoundCorrespondence_Letter (
+       LetterSoundCorrespondence_id bigint not null,
+        letters_id bigint not null,
+        letters_ORDER integer not null,
+        primary key (LetterSoundCorrespondence_id, letters_ORDER)
+    );
+
+    create table LetterSoundCorrespondence_Sound (
+       LetterSoundCorrespondence_id bigint not null,
+        sounds_id bigint not null,
+        sounds_ORDER integer not null,
+        primary key (LetterSoundCorrespondence_id, sounds_ORDER)
+    );
+
+    create table LetterSoundCorrespondenceContributionEvent (
+       id bigint generated by default as identity (start with 1),
+        comment varchar(1000),
+        platform varchar(255),
+        revisionNumber integer,
+        time timestamp,
+        timeSpentMs bigint,
+        contributor_id bigint,
+        letterSoundCorrespondence_id bigint,
+        primary key (id)
+    );
+
+    create table LetterSoundCorrespondencePeerReviewEvent (
+       id bigint generated by default as identity (start with 1),
+        approved boolean,
+        comment varchar(1000),
+        platform varchar(255),
+        time timestamp,
+        contributor_id bigint,
+        letterSoundCorrespondenceContributionEvent_id bigint,
+        primary key (id)
+    );
+
+    create table Number (
+       id bigint generated by default as identity (start with 1),
+        contentStatus varchar(255),
+        peerReviewStatus varchar(255),
+        revisionNumber integer,
+        timeLastUpdate timestamp,
+        usageCount integer,
+        symbol varchar(255),
+        value integer,
+        primary key (id)
+    );
+
+    create table Number_Word (
+       Number_id bigint not null,
+        words_id bigint not null,
+        words_ORDER integer not null,
+        primary key (Number_id, words_ORDER)
+    );
+
+    create table NumberContributionEvent (
+       id bigint generated by default as identity (start with 1),
+        comment varchar(1000),
+        platform varchar(255),
+        revisionNumber integer,
+        time timestamp,
+        timeSpentMs bigint,
+        contributor_id bigint,
+        number_id bigint,
+        primary key (id)
+    );
+
+    create table NumberPeerReviewEvent (
+       id bigint generated by default as identity (start with 1),
+        approved boolean,
+        comment varchar(1000),
+        platform varchar(255),
+        time timestamp,
+        contributor_id bigint,
+        numberContributionEvent_id bigint,
+        primary key (id)
+    );
+
+    create table Sound (
+       id bigint generated by default as identity (start with 1),
+        contentStatus varchar(255),
+        peerReviewStatus varchar(255),
+        revisionNumber integer,
+        timeLastUpdate timestamp,
+        usageCount integer,
+        consonantPlace varchar(255),
+        consonantType varchar(255),
+        consonantVoicing varchar(255),
+        diacritic boolean not null,
+        lipRounding varchar(255),
+        soundType varchar(255),
+        valueIpa varchar(3),
+        valueSampa varchar(5),
+        vowelFrontness varchar(255),
+        vowelHeight varchar(255),
+        vowelLength varchar(255),
+        audio_id bigint,
+        primary key (id)
+    );
+
+    create table SoundContributionEvent (
+       id bigint generated by default as identity (start with 1),
+        comment varchar(1000),
+        platform varchar(255),
+        revisionNumber integer,
+        time timestamp,
+        timeSpentMs bigint,
+        contributor_id bigint,
+        sound_id bigint,
+        primary key (id)
+    );
+
+    create table StoryBook (
+       id bigint generated by default as identity (start with 1),
+        contentStatus varchar(255),
+        peerReviewStatus varchar(255),
+        revisionNumber integer,
+        timeLastUpdate timestamp,
+        usageCount integer,
+        attributionUrl varchar(1000),
+        contentLicense varchar(255),
+        description varchar(1024),
+        readingLevel varchar(255),
+        title varchar(255),
+        coverImage_id bigint,
+        primary key (id)
+    );
+
+    create table StoryBookChapter (
+       id bigint generated by default as identity (start with 1),
+        sortOrder integer,
+        image_id bigint,
+        storyBook_id bigint,
+        primary key (id)
+    );
+
+    create table StoryBookContributionEvent (
+       id bigint generated by default as identity (start with 1),
+        comment varchar(1000),
+        platform varchar(255),
+        revisionNumber integer,
+        time timestamp,
+        timeSpentMs bigint,
+        paragraphTextAfter varchar(1000),
+        paragraphTextBefore varchar(1000),
+        contributor_id bigint,
+        storyBook_id bigint,
+        primary key (id)
+    );
+
+    create table StoryBookLearningEvent (
+       id bigint generated by default as identity (start with 1),
+        androidId varchar(255),
+        learningEventType varchar(255),
+        packageName varchar(255),
+        time timestamp,
+        storyBookId bigint,
+        storyBookTitle varchar(255),
+        application_id bigint,
+        storyBook_id bigint,
+        primary key (id)
+    );
+
+    create table StoryBookParagraph (
+       id bigint generated by default as identity (start with 1),
+        originalText varchar(1024),
+        sortOrder integer,
+        storyBookChapter_id bigint,
+        primary key (id)
+    );
+
+    create table StoryBookParagraph_Word (
+       StoryBookParagraph_id bigint not null,
+        words_id bigint not null,
+        words_ORDER integer not null,
+        primary key (StoryBookParagraph_id, words_ORDER)
+    );
+
+    create table StoryBookPeerReviewEvent (
+       id bigint generated by default as identity (start with 1),
+        approved boolean,
+        comment varchar(1000),
+        platform varchar(255),
+        time timestamp,
+        contributor_id bigint,
+        storyBookContributionEvent_id bigint,
+        primary key (id)
+    );
+
+    create table Syllable (
+       id bigint generated by default as identity (start with 1),
+        contentStatus varchar(255),
+        peerReviewStatus varchar(255),
+        revisionNumber integer,
+        timeLastUpdate timestamp,
+        usageCount integer,
+        text varchar(255),
+        primary key (id)
+    );
+
+    create table Syllable_Sound (
+       Syllable_id bigint not null,
+        sounds_id bigint not null,
+        sounds_ORDER integer not null,
+        primary key (Syllable_id, sounds_ORDER)
+    );
+
+    create table Video (
+       id bigint generated by default as identity (start with 1),
+        contentStatus varchar(255),
+        peerReviewStatus varchar(255),
+        revisionNumber integer,
+        timeLastUpdate timestamp,
+        usageCount integer,
+        attributionUrl varchar(1000),
+        contentLicense varchar(255),
+        contentType varchar(255),
+        bytes blob(209715200),
+        thumbnail blob(1048576),
+        title varchar(255),
+        videoFormat varchar(255),
+        primary key (id)
+    );
+
+    create table Video_Letter (
+       Video_id bigint not null,
+        letters_id bigint not null,
+        primary key (Video_id, letters_id)
+    );
+
+    create table Video_literacySkills (
+       Video_id bigint not null,
+        literacySkills varchar(255)
+    );
+
+    create table Video_Number (
+       Video_id bigint not null,
+        numbers_id bigint not null,
+        primary key (Video_id, numbers_id)
+    );
+
+    create table Video_numeracySkills (
+       Video_id bigint not null,
+        numeracySkills varchar(255)
+    );
+
+    create table Video_Word (
+       Video_id bigint not null,
+        words_id bigint not null,
+        primary key (Video_id, words_id)
+    );
+
+    create table Word (
+       id bigint generated by default as identity (start with 1),
+        contentStatus varchar(255),
+        peerReviewStatus varchar(255),
+        revisionNumber integer,
+        timeLastUpdate timestamp,
+        usageCount integer,
+        spellingConsistency varchar(255),
+        text varchar(255),
+        wordType varchar(255),
+        rootWord_id bigint,
+        primary key (id)
+    );
+
+    create table Word_LetterSoundCorrespondence (
+       Word_id bigint not null,
+        letterSoundCorrespondences_id bigint not null,
+        letterSoundCorrespondences_ORDER integer not null,
+        primary key (Word_id, letterSoundCorrespondences_ORDER)
+    );
+
+    create table WordContributionEvent (
+       id bigint generated by default as identity (start with 1),
+        comment varchar(1000),
+        platform varchar(255),
+        revisionNumber integer,
+        time timestamp,
+        timeSpentMs bigint,
+        contributor_id bigint,
+        word_id bigint,
+        primary key (id)
+    );
+
+    create table WordLearningEvent (
+       id bigint generated by default as identity (start with 1),
+        androidId varchar(255),
+        learningEventType varchar(255),
+        packageName varchar(255),
+        time timestamp,
+        wordText varchar(255),
+        application_id bigint,
+        word_id bigint,
+        primary key (id)
+    );
+
+    create table WordPeerReviewEvent (
+       id bigint generated by default as identity (start with 1),
+        approved boolean,
+        comment varchar(1000),
+        platform varchar(255),
+        time timestamp,
+        contributor_id bigint,
+        wordContributionEvent_id bigint,
+        primary key (id)
+    );
+
+    alter table Contributor 
+       add constraint UK_se15thb3bqtr3sw28rgf1v8ia unique (email);
+
+    alter table Contributor 
+       add constraint UK_g3my0evexejqgidmkse6suxt3 unique (providerIdWeb3);
+
+    alter table DbMigration 
+       add constraint UK_gdl53lyf9qvi56fmbrk9nfrg9 unique (version);
+
+    alter table Device 
+       add constraint UK_ktkbd0xm3q2nddw1xxtdaxjy7 unique (deviceId);
+
+    alter table Application 
+       add constraint FKn1pft600om9qs7dn754chjk67 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table Application_literacySkills 
+       add constraint FK6m0x1m1hks48tio7hdlcyumqq 
+       foreign key (Application_id) 
+       references Application;
+
+    alter table Application_numeracySkills 
+       add constraint FK858mh1kg9x9w8oqip0mkf53tr 
+       foreign key (Application_id) 
+       references Application;
+
+    alter table ApplicationVersion 
+       add constraint FKf2y9evfvnfd82cot9dhk0ue54 
+       foreign key (application_id) 
+       references Application;
+
+    alter table ApplicationVersion 
+       add constraint FKbmfakjprck5g1jlh74xpmp0j7 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table Audio 
+       add constraint FKohdvhlrrancsjct22f3y0os89 
+       foreign key (storyBookParagraph_id) 
+       references StoryBookParagraph;
+
+    alter table Audio 
+       add constraint FK1bkjicci0k63irniwg0fm9ans 
+       foreign key (word_id) 
+       references Word;
+
+    alter table Audio_Letter 
+       add constraint FKqjf1gijq56ob68ug5048bfaci 
+       foreign key (letters_id) 
+       references Letter;
+
+    alter table Audio_Letter 
+       add constraint FKsqpvtu98kcwp9mr75fh8eulf9 
+       foreign key (Audio_id) 
+       references Audio;
+
+    alter table Audio_literacySkills 
+       add constraint FKrch8svr2vr7vf2v9ojyh6326r 
+       foreign key (Audio_id) 
+       references Audio;
+
+    alter table Audio_Number 
+       add constraint FKyr69l8fg58o8ia369q106l5q 
+       foreign key (numbers_id) 
+       references Number;
+
+    alter table Audio_Number 
+       add constraint FK9wkeuh81ec6supbcr70yvo73k 
+       foreign key (Audio_id) 
+       references Audio;
+
+    alter table Audio_numeracySkills 
+       add constraint FKi8d6h9e6l39hll19wng6p32lp 
+       foreign key (Audio_id) 
+       references Audio;
+
+    alter table Audio_Word 
+       add constraint FKq2afgtopap8nf5xmahk0rvo6 
+       foreign key (words_id) 
+       references Word;
+
+    alter table Audio_Word 
+       add constraint FKdt7dvkfoa2ne8ssgtq44s3yte 
+       foreign key (Audio_id) 
+       references Audio;
+
+    alter table AudioContributionEvent 
+       add constraint FKk5x3wa0d4qp54r94o7tky3mrt 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table AudioContributionEvent 
+       add constraint FKspea1r50sj31ovaw0cmsrdd1t 
+       foreign key (audio_id) 
+       references Audio;
+
+    alter table AudioPeerReviewEvent 
+       add constraint FKqacw1s4ljilnjcjp5ldqtbjti 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table AudioPeerReviewEvent 
+       add constraint FK9750pa9ak23p1y0lwft00vkch 
+       foreign key (audioContributionEvent_id) 
+       references AudioContributionEvent;
+
+    alter table Contributor_roles 
+       add constraint FKriv03x8alxet23b7b4ivk2vot 
+       foreign key (Contributor_id) 
+       references Contributor;
+
+    alter table Emoji_Word 
+       add constraint FKbkw2j0k8qfhx43docakb9j5ve 
+       foreign key (words_id) 
+       references Word;
+
+    alter table Emoji_Word 
+       add constraint FKlwplucw359d2d5i4yelfkwy6f 
+       foreign key (Emoji_id) 
+       references Emoji;
+
+    alter table Image_Letter 
+       add constraint FK9pi4lblfl1s807tlif82cm5mt 
+       foreign key (letters_id) 
+       references Letter;
+
+    alter table Image_Letter 
+       add constraint FK4gkpmcffc4upm7mrudt4clux4 
+       foreign key (Image_id) 
+       references Image;
+
+    alter table Image_literacySkills 
+       add constraint FKase42u556a5hkq1qau359sohp 
+       foreign key (Image_id) 
+       references Image;
+
+    alter table Image_Number 
+       add constraint FKitwj5vppcji5now11mp8icipa 
+       foreign key (numbers_id) 
+       references Number;
+
+    alter table Image_Number 
+       add constraint FK70i88cwc0frkrx6lo2hjuav4v 
+       foreign key (Image_id) 
+       references Image;
+
+    alter table Image_numeracySkills 
+       add constraint FKlsmoxnf75p3c9bsstqxjy39cx 
+       foreign key (Image_id) 
+       references Image;
+
+    alter table Image_Word 
+       add constraint FKo4boxy1gphgg94k7gsyyf2gkh 
+       foreign key (words_id) 
+       references Word;
+
+    alter table Image_Word 
+       add constraint FKm6hxhjn1og47ovf4xyt6uaqff 
+       foreign key (Image_id) 
+       references Image;
+
+    alter table ImageContributionEvent 
+       add constraint FKlw0g62yxana6js9f7hpc4hybc 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table ImageContributionEvent 
+       add constraint FK9v3p0869ivi1jeohpkn8sttr0 
+       foreign key (image_id) 
+       references Image;
+
+    alter table LetterContributionEvent 
+       add constraint FKrrosmtv3fcec9acjayfruop5 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table LetterContributionEvent 
+       add constraint FK5do5q62aj1bilg8pwmphr4ugl 
+       foreign key (letter_id) 
+       references Letter;
+
+    alter table LetterLearningEvent 
+       add constraint FKbgt0ocoif6wvshp6lyasfdmq7 
+       foreign key (application_id) 
+       references Application;
+
+    alter table LetterLearningEvent 
+       add constraint FKfheqcx945pkedcq0vnlcuayct 
+       foreign key (letter_id) 
+       references Letter;
+
+    alter table LetterSoundCorrespondence_Letter 
+       add constraint FKhiri2loopmprnhud2jiu639ue 
+       foreign key (letters_id) 
+       references Letter;
+
+    alter table LetterSoundCorrespondence_Letter 
+       add constraint FKe8u07ekjdxhvqqfxclsloax4a 
+       foreign key (LetterSoundCorrespondence_id) 
+       references LetterSoundCorrespondence;
+
+    alter table LetterSoundCorrespondence_Sound 
+       add constraint FKogybx13b6mfullxvgs9ienb9v 
+       foreign key (sounds_id) 
+       references Sound;
+
+    alter table LetterSoundCorrespondence_Sound 
+       add constraint FKt96gcgkuh6ho034lfjbgu5j79 
+       foreign key (LetterSoundCorrespondence_id) 
+       references LetterSoundCorrespondence;
+
+    alter table LetterSoundCorrespondenceContributionEvent 
+       add constraint FKouellxtx1de1wpddv5x72h9jn 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table LetterSoundCorrespondenceContributionEvent 
+       add constraint FKm1rttrlv6gxibd85a5sc3c4js 
+       foreign key (letterSoundCorrespondence_id) 
+       references LetterSoundCorrespondence;
+
+    alter table LetterSoundCorrespondencePeerReviewEvent 
+       add constraint FKnx18la2q9jr95bmprkttiymxc 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table LetterSoundCorrespondencePeerReviewEvent 
+       add constraint FK1cxnf96s8gpl1nuartfcy5gbc 
+       foreign key (letterSoundCorrespondenceContributionEvent_id) 
+       references LetterSoundCorrespondenceContributionEvent;
+
+    alter table Number_Word 
+       add constraint FKspo8bt34fftva3y5jac7p2no1 
+       foreign key (words_id) 
+       references Word;
+
+    alter table Number_Word 
+       add constraint FKim83prd786jsowiyrhdf1vo59 
+       foreign key (Number_id) 
+       references Number;
+
+    alter table NumberContributionEvent 
+       add constraint FK8tr84kkqmavan1jxfmc1pq8h6 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table NumberContributionEvent 
+       add constraint FKkfyssxfqg6x1vygyhjks96m4u 
+       foreign key (number_id) 
+       references Number;
+
+    alter table NumberPeerReviewEvent 
+       add constraint FKhcm34w6kojhaiqneed300n9p8 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table NumberPeerReviewEvent 
+       add constraint FKtq7b81iqfw1dxuk79c2se2onu 
+       foreign key (numberContributionEvent_id) 
+       references NumberContributionEvent;
+
+    alter table Sound 
+       add constraint FKg3qs5563grk5e6f1idffmklh4 
+       foreign key (audio_id) 
+       references Audio;
+
+    alter table SoundContributionEvent 
+       add constraint FKbuah2o1ndo9kpbj39gr8tic3t 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table SoundContributionEvent 
+       add constraint FK2vw08gkdxfbcp4ufji6nsuyoi 
+       foreign key (sound_id) 
+       references Sound;
+
+    alter table StoryBook 
+       add constraint FKkwr1b53nrmjdvd874vsiql21a 
+       foreign key (coverImage_id) 
+       references Image;
+
+    alter table StoryBookChapter 
+       add constraint FKcnlksdikth82ec6nia8tb3cps 
+       foreign key (image_id) 
+       references Image;
+
+    alter table StoryBookChapter 
+       add constraint FKaqnew7dipgs9ffkfh2js25l1g 
+       foreign key (storyBook_id) 
+       references StoryBook;
+
+    alter table StoryBookContributionEvent 
+       add constraint FK3s4f77htgff63dqy4diam9fc9 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table StoryBookContributionEvent 
+       add constraint FKpuk0ynailkg93eiaf62tn2phy 
+       foreign key (storyBook_id) 
+       references StoryBook;
+
+    alter table StoryBookLearningEvent 
+       add constraint FK8f7cr6xa4n3kgrmffy7crtcrn 
+       foreign key (application_id) 
+       references Application;
+
+    alter table StoryBookLearningEvent 
+       add constraint FKi731lr5iofppbd0lod4pjoufr 
+       foreign key (storyBook_id) 
+       references StoryBook;
+
+    alter table StoryBookParagraph 
+       add constraint FKdna2npdcgkq74v2306anb4f6s 
+       foreign key (storyBookChapter_id) 
+       references StoryBookChapter;
+
+    alter table StoryBookParagraph_Word 
+       add constraint FKecjq9ll62036jtbwl3g9vytg8 
+       foreign key (words_id) 
+       references Word;
+
+    alter table StoryBookParagraph_Word 
+       add constraint FK6kx5ydfx49dfl5oy44bold81k 
+       foreign key (StoryBookParagraph_id) 
+       references StoryBookParagraph;
+
+    alter table StoryBookPeerReviewEvent 
+       add constraint FKjc6t09q4xff532a4s8jocuvs1 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table StoryBookPeerReviewEvent 
+       add constraint FKe1bnu38w5m0dc0qkeuuxf4g5h 
+       foreign key (storyBookContributionEvent_id) 
+       references StoryBookContributionEvent;
+
+    alter table Syllable_Sound 
+       add constraint FKlfp5s4xc4wi7s7fo980027tl1 
+       foreign key (sounds_id) 
+       references Sound;
+
+    alter table Syllable_Sound 
+       add constraint FK627nj3gkx5dn4xn9g4tmnmbdx 
+       foreign key (Syllable_id) 
+       references Syllable;
+
+    alter table Video_Letter 
+       add constraint FK426jmgm09qif0fhqke99ejl8c 
+       foreign key (letters_id) 
+       references Letter;
+
+    alter table Video_Letter 
+       add constraint FKlmbmpg1y1jue79i9w0f3ejetp 
+       foreign key (Video_id) 
+       references Video;
+
+    alter table Video_literacySkills 
+       add constraint FKcp7t3km7xi2wkraaugjuk5xoo 
+       foreign key (Video_id) 
+       references Video;
+
+    alter table Video_Number 
+       add constraint FK5lrjvgqa5wnd49g6gsohlm0tg 
+       foreign key (numbers_id) 
+       references Number;
+
+    alter table Video_Number 
+       add constraint FKr064lw8ryd35xks27348u2s9a 
+       foreign key (Video_id) 
+       references Video;
+
+    alter table Video_numeracySkills 
+       add constraint FKt545qojkqdegjg5muf41ltk86 
+       foreign key (Video_id) 
+       references Video;
+
+    alter table Video_Word 
+       add constraint FK2un2s9ljli58i2qkjmvdpwfc7 
+       foreign key (words_id) 
+       references Word;
+
+    alter table Video_Word 
+       add constraint FKplswdv1whriquc00dsaxrqe0s 
+       foreign key (Video_id) 
+       references Video;
+
+    alter table Word 
+       add constraint FKd1ussioi3bpu2tmxm0cim5s5a 
+       foreign key (rootWord_id) 
+       references Word;
+
+    alter table Word_LetterSoundCorrespondence 
+       add constraint FKf6r3yfdc6quwa0b13mln5uuc8 
+       foreign key (letterSoundCorrespondences_id) 
+       references LetterSoundCorrespondence;
+
+    alter table Word_LetterSoundCorrespondence 
+       add constraint FKemcgw1900hl4aumckhof0574i 
+       foreign key (Word_id) 
+       references Word;
+
+    alter table WordContributionEvent 
+       add constraint FKrsen7udud4svhc32e3rhkcmnu 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table WordContributionEvent 
+       add constraint FKkwqjkxvg3rvmp1kys6fr8blwq 
+       foreign key (word_id) 
+       references Word;
+
+    alter table WordLearningEvent 
+       add constraint FKb5jjaetgs99whlxywbi0palby 
+       foreign key (application_id) 
+       references Application;
+
+    alter table WordLearningEvent 
+       add constraint FK221ytgbt7u8eajdics6a5sloe 
+       foreign key (word_id) 
+       references Word;
+
+    alter table WordPeerReviewEvent 
+       add constraint FKp3i671x4kb823ayc73381gk33 
+       foreign key (contributor_id) 
+       references Contributor;
+
+    alter table WordPeerReviewEvent 
+       add constraint FKjyi59inavblt0afri8vd3xhw1 
+       foreign key (wordContributionEvent_id) 
+       references WordContributionEvent;