Add report + moderation messaging (#567)

* Add report + moderation messaging

* Add system messages

* address review comments

* Remove ds store

* Update messaging

* run prep

---------

Co-authored-by: Geometrically <geometrically@Jais-MacBook-Pro.local>

migrations/20230324202117_messaging.sql

@@ -0,0 +1,32 @@
+-- Add migration script here
+
+-- Add route for users to see their own reports
+
+CREATE TABLE threads (
+    id bigint PRIMARY KEY,
+    -- can be either "report", "project", or "direct_message". direct message is unused for now
+    thread_type VARCHAR(64) NOT NULL
+);
+
+CREATE TABLE threads_messages (
+    id bigint PRIMARY KEY,
+    thread_id bigint REFERENCES threads ON UPDATE CASCADE NOT NULL,
+    -- If this is null, it's a system message
+    author_id bigint REFERENCES users ON UPDATE CASCADE NULL,
+    body jsonb NOT NULL,
+    created timestamptz DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    show_in_mod_inbox BOOLEAN NOT NULL DEFAULT FALSE
+);
+
+CREATE TABLE threads_members (
+ thread_id bigint REFERENCES threads ON UPDATE CASCADE NOT NULL,
+ user_id bigint REFERENCES users ON UPDATE CASCADE NOT NULL,
+ PRIMARY KEY (thread_id, user_id)
+);
+
+ALTER TABLE reports
+    ADD COLUMN closed boolean NOT NULL DEFAULT FALSE;
+ALTER TABLE reports
+    ADD COLUMN thread_id bigint references threads ON UPDATE CASCADE;
+ALTER TABLE mods
+    ADD COLUMN thread_id bigint references threads ON UPDATE CASCADE;