[DB] Fix Doctrine errors due to lack of column uniqueness

So, Doctrine doesn't like that `GSActorTag.tag` is not unique, even
though composite key `[tagger, tag]` is. `tag` can't unique, but
doctrine doesn't understand this. This seems like a Doctrine bug that
should be investigated. For now we'll just not mark it as a foreign
key

src/Entity/GSActor.php

@@ -296,6 +296,9 @@ class GSActor extends Entity
                 'modified'         => ['type' => 'timestamp', 'not null' => true, 'default' => 'CURRENT_TIMESTAMP', 'description' => 'date this record was modified'],
             ],
             'primary key' => ['id'],
+            'unique keys' => [
+                'gsactor_nickname_uniq' => ['nickname'],
+            ],
             'indexes' => [
                 'gsactor_nickname_idx' => ['nickname'],
             ],

src/Entity/GSActorCircle.php

@@ -133,7 +133,8 @@ class GSActorCircle extends Entity
             'description' => 'a gsactor can have lists of gsactors, to separate their timeline',
             'fields'      => [
                 'tagger' => ['type' => 'int',       'foreign key' => true, 'target' => 'GSActor.id', 'multiplicity' => 'many to one', 'name' => 'gsactor_list_tagger_fkey', 'not null' => true, 'description' => 'user making the tag'],
-                'tag'         => ['type' => 'varchar',   'foreign key' => true, 'length' => 64, 'target' => 'GSActorTag.tag', 'multiplicity' => 'many to one', 'not null' => true, 'description' => 'gsactor tag'], // Join with GSActorTag
+                'tag'    => ['type' => 'varchar',   'length' => 64 //, 'foreign key' => true, 'target' => 'GSActorTag.tag', 'multiplicity' => 'many to one' // so, Doctrine doesn't like that the target is not unique, even though the pair is
+                    , 'not null'    => true, 'description' => 'gsactor tag', ], // Join with GSActorTag
                 'description' => ['type' => 'text',      'description' => 'description of the people tag'],
                 'private'     => ['type' => 'bool',      'default' => false, 'description' => 'is this tag private'],
                 'created'     => ['type' => 'datetime',  'not null' => true, 'default' => 'CURRENT_TIMESTAMP', 'description' => 'date this record was created'],

src/Entity/GSActorTagFollow.php

@@ -95,8 +95,9 @@ class GSActorTagFollow extends Entity
         return [
             'name'   => 'gsactor_tag_follow',
             'fields' => [
-                'gsactor_tag' => ['type' => 'int',       'foreign key' => true, 'target' => 'GSActorTag.tag', 'multiplicity' => 'one to one', 'name' => 'gsactor_tag_follow_gsactor_tag_fkey', 'not null' => true, 'description' => 'foreign key to gsactor_tag'],
                 'gsactor_id'  => ['type' => 'int',       'foreign key' => true, 'target' => 'GSActor.id', 'multiplicity' => 'one to one', 'name' => 'gsactor_tag_follow_gsactor_id_fkey', 'not null' => true, 'description' => 'foreign key to gsactor table'],
+                'gsactor_tag' => ['type' => 'int',       // 'foreign key' => true, 'target' => 'GSActorTag.tag', 'multiplicity' => 'one to one', // tag can't unique, but doctrine doesn't understand this
+                    'name'               => 'gsactor_tag_follow_gsactor_tag_fkey', 'not null' => true, 'description' => 'foreign key to gsactor_tag', ],
                 'created'  => ['type' => 'datetime',  'not null' => true,    'default' => 'CURRENT_TIMESTAMP', 'description' => 'date this record was created'],
                 'modified' => ['type' => 'timestamp', 'not null' => true,    'default' => 'CURRENT_TIMESTAMP', 'description' => 'date this record was modified'],
             ],