moved post relations to own table

init/00_InitDB.sql

@@ -14,8 +14,6 @@ CREATE TABLE Posts
 (
     id              bigserial PRIMARY KEY,
     author          bigserial REFERENCES Users(id) NOT NULL,
-    reference       bigserial REFERENCES Posts(id) NOT NULL,
-    -- init with (select last_val from posts_id_seq)
     title           varchar(255) NOT NULL,
     content         varchar(1023) NOT NULL,
     postDate        timestamp WITH TIME ZONE NOT NULL DEFAULT now(),
@@ -23,6 +21,13 @@ CREATE TABLE Posts
     deleted         timestamp WITH TIME ZONE default NULL
 );
 
+CREATE TABLE Answers (
+    id              bigserial PRIMARY KEY,
+    parent          bigserial REFERENCES Posts,
+    child           bigserial REFERENCES Posts,
+    deleted         timestamp WITH TIME ZONE default NULL
+);
+
 CREATE TABLE Reaction
 (
     id              bigserial PRIMARY KEY,