Manage the Slack digest in the admin

New settings area: the webhook lives in the database and is only shown
shortened afterwards, the environment variable stays as a fallback. A switch
decides whether internal entries travel, a button sends the digest right
away, and every run is recorded with period, count, projects, result and
who triggered it.

drizzle/0011_concerned_domino.sql

@@ -0,0 +1,17 @@
+CREATE TABLE "app_setting" (
+	"key" text PRIMARY KEY NOT NULL,
+	"value" text NOT NULL,
+	"updated_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE "report_run" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL,
+	"from_at" timestamp with time zone NOT NULL,
+	"to_at" timestamp with time zone NOT NULL,
+	"total" integer NOT NULL,
+	"projects" jsonb DEFAULT '[]'::jsonb NOT NULL,
+	"sent" boolean DEFAULT false NOT NULL,
+	"trigger" text NOT NULL,
+	"detail" text
+);