Fix various Hibernate mapping oversights.

Change-Id: Iff22c68a718d6f65734e166cd08f4049ccc196ec
diff --git a/src/main/java/eu/mulk/mulkcms2/benki/posts/PostText.java b/src/main/java/eu/mulk/mulkcms2/benki/posts/PostText.java
index d25615e..177c590 100644
--- a/src/main/java/eu/mulk/mulkcms2/benki/posts/PostText.java
+++ b/src/main/java/eu/mulk/mulkcms2/benki/posts/PostText.java
@@ -47,7 +47,7 @@
   @CheckForNull
   public String cachedDescriptionHtml;
 
-  @Column(name = "search_terms")
+  @Column(name = "search_terms", columnDefinition = "tsvector")
   @Generated(event = {INSERT, UPDATE})
   @Type(value = PostgreSQLTSVectorType.class)
   public String searchTerms;