* change db schema

docs/schema.sqlite3.sql

@@ -16,12 +16,14 @@ CREATE TABLE "pages" (
     ON DELETE CASCADE ON UPDATE CASCADE
 );
 
-CREATE UNIQUE INDEX "pages_uniq" ON "pages" ("hash");
+CREATE UNIQUE INDEX "pages_uniq" ON "pages" ("sid", "hash");
 
 CREATE TABLE "comments" (
   "id" INTEGER PRIMARY KEY NOT NULL,
   "pid"   int(11) NOT NULL,
   "seq"   int(11) NOT NULL,
+  "date"  int(11) NOT NULL,
+  "reply" int(11) NOT NULL DEFAULT 0,
   "name"  varchar(255) NOT NULL DEFAULT '',
   "email" varchar(255) NOT NULL DEFAULT '',
   "text" text NOT NULL,