Rename columns named value

This addresses #660.

`value` is a keyword in SQL.

This used to not be an issue,
and it continues to work with MariaDB and Postgres,
but newer versions of h2,
specifically the one used in Opencast,
choke on this.

I tried to work around this using quoting,
but Postgres treats quoted identifiers in a non-standard way,
so that doesn't work cross-platform, either.

I opted to just rename the columns `value_`,
which is [not ideal](#663),
but since this targets `stable`,
it's the simplest way to handle forward merges.

Note, that you need to migrate your database!
Due to the exact compatibility issues this is trying to fix,
it's hard to provide a portable script.
Please refer to the documentation of your respective database
to do something to the effect of

```sql
alter table xannotations_annotation_tags rename column value to value_;
alter table xannotations_category_tags rename column value to value_;
alter table xannotations_comment_tags rename column value to value_;
alter table xannotations_label_tags rename column value to value_;
alter table xannotations_scale_tags rename column value to value_;
alter table xannotations_scale_value_tags rename column value to value_;
alter table xannotations_track_tags rename column value to value_;
alter table xannotations_user_tags rename column value to value_;
alter table xannotations_video_tags rename column value to value_;
alter table xannotations_label rename column value to value_;
alter table xannotations_scale_value rename column value to value_;
```

Author: JulianKniephoff

opencast-backend/annotation-impl/src/main/java/org/opencast/annotation/impl/persistence/AnnotationDto.java

@@ -103,7 +103,7 @@ public class AnnotationDto extends AbstractResourceDto {
 
   @ElementCollection
   @MapKeyColumn(name = "name")
-  @Column(name = "value")
+  @Column(name = "value_")
   @CollectionTable(name = "xannotations_annotation_tags", joinColumns = @JoinColumn(name = "annotation_id"))
   protected Map<String, String> tags = new HashMap<String, String>();
 

opencast-backend/annotation-impl/src/main/java/org/opencast/annotation/impl/persistence/CategoryDto.java

@@ -101,7 +101,7 @@ public class CategoryDto extends AbstractResourceDto {
 
   @ElementCollection
   @MapKeyColumn(name = "name")
-  @Column(name = "value")
+  @Column(name = "value_")
   @CollectionTable(name = "xannotations_category_tags", joinColumns = @JoinColumn(name = "category_id"))
   protected Map<String, String> tags = new HashMap<String, String>();
 

opencast-backend/annotation-impl/src/main/java/org/opencast/annotation/impl/persistence/CommentDto.java

@@ -89,7 +89,7 @@ public class CommentDto extends AbstractResourceDto {
 
   @ElementCollection
   @MapKeyColumn(name = "name")
-  @Column(name = "value")
+  @Column(name = "value_")
   @CollectionTable(name = "xannotations_comment_tags", joinColumns = @JoinColumn(name = "comment_id"))
   protected Map<String, String> tags = new HashMap<String, String>();
 

opencast-backend/annotation-impl/src/main/java/org/opencast/annotation/impl/persistence/LabelDto.java

@@ -77,7 +77,7 @@ public class LabelDto extends AbstractResourceDto {
   @Column(name = "series_label_id")
   private Long seriesLabelId;
 
-  @Column(name = "value", nullable = false)
+  @Column(name = "value_", nullable = false)
   private String value;
 
   @Column(name = "abbreviation", nullable = false)
@@ -95,7 +95,7 @@ public class LabelDto extends AbstractResourceDto {
 
   @ElementCollection
   @MapKeyColumn(name = "name")
-  @Column(name = "value")
+  @Column(name = "value_")
   @CollectionTable(name = "xannotations_label_tags", joinColumns = @JoinColumn(name = "label_id"))
   protected Map<String, String> tags = new HashMap<String, String>();
 

opencast-backend/annotation-impl/src/main/java/org/opencast/annotation/impl/persistence/ScaleDto.java

@@ -87,7 +87,7 @@ public class ScaleDto extends AbstractResourceDto {
 
   @ElementCollection
   @MapKeyColumn(name = "name")
-  @Column(name = "value")
+  @Column(name = "value_")
   @CollectionTable(name = "xannotations_scale_tags", joinColumns = @JoinColumn(name = "scale_id"))
   protected Map<String, String> tags = new HashMap<String, String>();
 

opencast-backend/annotation-impl/src/main/java/org/opencast/annotation/impl/persistence/ScaleValueDto.java

@@ -75,7 +75,7 @@ public class ScaleValueDto extends AbstractResourceDto {
   @Column(name = "name", nullable = false)
   private String name;
 
-  @Column(name = "value", nullable = false)
+  @Column(name = "value_", nullable = false)
   private double value;
 
   @Column(name = "order_value", nullable = false)
@@ -87,7 +87,7 @@ public class ScaleValueDto extends AbstractResourceDto {
 
   @ElementCollection
   @MapKeyColumn(name = "name")
-  @Column(name = "value")
+  @Column(name = "value_")
   @CollectionTable(name = "xannotations_scale_value_tags", joinColumns = @JoinColumn(name = "scale_value_id"))
   protected Map<String, String> tags = new HashMap<String, String>();
 

opencast-backend/annotation-impl/src/main/java/org/opencast/annotation/impl/persistence/TrackDto.java

@@ -87,7 +87,7 @@ public class TrackDto extends AbstractResourceDto {
 
   @ElementCollection
   @MapKeyColumn(name = "name")
-  @Column(name = "value")
+  @Column(name = "value_")
   @CollectionTable(name = "xannotations_track_tags", joinColumns = @JoinColumn(name = "track_id"))
   protected Map<String, String> tags = new HashMap<String, String>();
 

opencast-backend/annotation-impl/src/main/java/org/opencast/annotation/impl/persistence/UserDto.java

@@ -84,7 +84,7 @@ public class UserDto extends AbstractResourceDto {
 
   @ElementCollection
   @MapKeyColumn(name = "name")
-  @Column(name = "value")
+  @Column(name = "value_")
   @CollectionTable(name = "xannotations_user_tags", joinColumns = @JoinColumn(name = "user_id"))
   protected Map<String, String> tags = new HashMap<String, String>();
 

opencast-backend/annotation-impl/src/main/java/org/opencast/annotation/impl/persistence/VideoDto.java

@@ -73,7 +73,7 @@ public final class VideoDto extends AbstractResourceDto {
 
   @ElementCollection
   @MapKeyColumn(name = "name")
-  @Column(name = "value")
+  @Column(name = "value_")
   @CollectionTable(name = "xannotations_video_tags", joinColumns = @JoinColumn(name = "video_id"))
   protected Map<String, String> tags = new HashMap<String, String>();