chore(coderd/database): add tasks data model (#19749)

Part of https://github.com/coder/internal/issues/948

Adds the initial part of the tasks data model as per the RFC.

coderd/database/migrations/000366_create_tasks_data_model.down.sql

@@ -0,0 +1,2 @@
+DROP TABLE task_workspace_apps;
+DROP TABLE tasks;

coderd/database/migrations/000366_create_tasks_data_model.up.sql

@@ -0,0 +1,19 @@
+CREATE TABLE tasks (
+	id                  UUID        NOT NULL PRIMARY KEY,
+	organization_id     UUID        NOT NULL REFERENCES organizations     (id) ON DELETE CASCADE,
+	owner_id            UUID        NOT NULL REFERENCES users             (id) ON DELETE CASCADE,
+	name                TEXT        NOT NULL,
+	workspace_id        UUID                 REFERENCES workspaces        (id) ON DELETE CASCADE,
+	template_version_id UUID        NOT NULL REFERENCES template_versions (id) ON DELETE CASCADE,
+	template_parameters JSONB       NOT NULL DEFAULT '{}'::JSONB,
+	prompt              TEXT        NOT NULL,
+	created_at          TIMESTAMPTZ NOT NULL,
+	deleted_at          TIMESTAMPTZ
+);
+
+CREATE TABLE task_workspace_apps (
+	task_id            UUID NOT NULL REFERENCES tasks            (id) ON DELETE CASCADE,
+	workspace_build_id UUID NOT NULL REFERENCES workspace_builds (id) ON DELETE CASCADE,
+	workspace_agent_id UUID NOT NULL REFERENCES workspace_agents (id) ON DELETE CASCADE,
+	workspace_app_id   UUID NOT NULL REFERENCES workspace_apps   (id) ON DELETE CASCADE
+);

coderd/database/migrations/testdata/fixtures/000366_create_tasks_data_model.up.sql

@@ -0,0 +1,19 @@
+INSERT INTO public.tasks VALUES (
+    'f5a1c3e4-8b2d-4f6a-9d7e-2a8b5c9e1f3d', -- id
+    'bb640d07-ca8a-4869-b6bc-ae61ebb2fda1', -- organization_id
+    '30095c71-380b-457a-8995-97b8ee6e5307', -- owner_id
+    'Test Task 1',                          -- name
+    '3a9a1feb-e89d-457c-9d53-ac751b198ebe', -- workspace_id
+    '920baba5-4c64-4686-8b7d-d1bef5683eae', -- template_version_id
+    '{}'::JSONB,                            -- template_parameters
+    'Create a React component for tasks',   -- prompt
+    '2024-11-02 13:10:00.000000+02',        -- created_at
+    NULL                                    -- deleted_at
+) ON CONFLICT DO NOTHING;
+
+INSERT INTO public.task_workspace_apps VALUES (
+    'f5a1c3e4-8b2d-4f6a-9d7e-2a8b5c9e1f3d', -- task_id
+    'a8c0b8c5-c9a8-4f33-93a4-8142e6858244', -- workspace_build_id
+    '8fa17bbd-c48c-44c7-91ae-d4acbc755fad', -- workspace_agent_id
+    'a47965a2-0a25-4810-8cc9-d283c86ab34c'  -- workspace_app_id
+) ON CONFLICT DO NOTHING;