Fixed bounce/session statistics and updated pirsch to dev version.

schema/0002_pirsch_update.up.sql

@@ -0,0 +1,23 @@
+ALTER TABLE "hit" ADD COLUMN "screen_width" integer DEFAULT 0;
+ALTER TABLE "hit" ADD COLUMN "screen_height" integer DEFAULT 0;
+
+CREATE TABLE "screen_stats" (
+    id bigint NOT NULL UNIQUE,
+    tenant_id bigint,
+    day date NOT NULL,
+    visitors integer NOT NULL,
+    width integer NOT NULL,
+    height integer NOT NULL
+);
+
+CREATE SEQUENCE screen_stats_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+ALTER SEQUENCE screen_stats_id_seq OWNED BY "screen_stats".id;
+ALTER TABLE ONLY "screen_stats" ALTER COLUMN id SET DEFAULT nextval('screen_stats_id_seq'::regclass);
+ALTER TABLE ONLY "screen_stats" ADD CONSTRAINT screen_stats_pkey PRIMARY KEY (id);
+CREATE INDEX screen_stats_day_index ON screen_stats(day);