start reports/moderation in backend

scripts/migrate/010_reports.sql

@@ -0,0 +1,19 @@
+-- +migrate Up
+
+-- 2023-03-19: Add moderation-related tables
+
+alter table users add column is_admin boolean not null default false;
+
+create table reports (
+    id          serial primary key,
+    -- we keep deleted users for 180 days after deletion, so it's fine to tie this to a user object
+    user_id     text not null references users (id) on delete cascade,
+    member_id   text null references members (id) on delete set null,
+    reason      text not null,
+    reporter_id text not null,
+
+    created_at    timestamptz not null default now(),
+    resolved_at   timestamptz,
+    admin_id      text null references users (id) on delete set null,
+    admin_comment text
+);