feature #3: create table article

resources/sql/migrations/0000-init.down.sql

@@ -0,0 +1,4 @@
+drop trigger generate_version_number_trigger on article;
+drop table article;
+drop function generate_version_number(regclass, uuid);
+drop function set_version_number();

resources/sql/migrations/0000-init.up.sql

@@ -0,0 +1,33 @@
+create or replace function generate_version_number(tablename regclass, version_id uuid) returns int
+    language plpgsql as
+$$
+begin
+    return random(); -- TODO
+end;
+$$;
+
+create or replace function set_version_number() returns trigger
+    language plpgsql as
+$$
+begin
+    new.version_number = generate_version_number(TG_TABLE_NAME::regclass, new.version_id);
+end;
+$$;
+
+create table article
+(
+    id             uuid          default uuid_generate_v4() not null,
+    version_id     uuid          default uuid_generate_v4() not null,
+    version_number int                                      not null,
+    title          text                                     not null,
+    annonymous     boolean       default false              not null,
+    content        text                                     not null,
+    description    text,
+    tags           varchar(32)[] default '{}'               not null,
+    created_at     timestamptz   default now()              not null
+);
+
+CREATE TRIGGER generate_version_number_trigger
+    BEFORE INSERT
+    ON article
+EXECUTE PROCEDURE set_version_number();