chore: add "user_configs" db table (#16564)

coderd/database/migrations/000299_user_configs.down.sql

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+-- Put back "theme_preference" column
+ALTER TABLE users ADD COLUMN IF NOT EXISTS
+  theme_preference text DEFAULT ''::text NOT NULL;
+
+-- Copy "theme_preference" back to "users"
+UPDATE users
+	SET theme_preference = (SELECT value
+    FROM user_configs
+    WHERE user_configs.user_id = users.id
+		  AND user_configs.key = 'theme_preference');
+
+-- Drop the "user_configs" table.
+DROP TABLE user_configs;
+
+-- Replace "group_members_expanded", and bring back with "theme_preference"
+DROP VIEW group_members_expanded;
+-- Taken from 000242_group_members_view.up.sql
+CREATE VIEW
+	group_members_expanded
+AS
+-- If the group is a user made group, then we need to check the group_members table.
+-- If it is the "Everyone" group, then we need to check the organization_members table.
+WITH all_members AS (
+	SELECT user_id, group_id FROM group_members
+	UNION
+	SELECT user_id, organization_id AS group_id FROM organization_members
+)
+SELECT
+	users.id AS user_id,
+	users.email AS user_email,
+	users.username AS user_username,
+	users.hashed_password AS user_hashed_password,
+	users.created_at AS user_created_at,
+	users.updated_at AS user_updated_at,
+	users.status AS user_status,
+	users.rbac_roles AS user_rbac_roles,
+	users.login_type AS user_login_type,
+	users.avatar_url AS user_avatar_url,
+	users.deleted AS user_deleted,
+	users.last_seen_at AS user_last_seen_at,
+	users.quiet_hours_schedule AS user_quiet_hours_schedule,
+	users.theme_preference AS user_theme_preference,
+	users.name AS user_name,
+	users.github_com_user_id AS user_github_com_user_id,
+	groups.organization_id AS organization_id,
+	groups.name AS group_name,
+	all_members.group_id AS group_id
+FROM
+	all_members
+JOIN
+	users ON users.id = all_members.user_id
+JOIN
+	groups ON groups.id = all_members.group_id
+WHERE
+	users.deleted = 'false';
+
+COMMENT ON VIEW group_members_expanded IS 'Joins group members with user information, organization ID, group name. Includes both regular group members and organization members (as part of the "Everyone" group).';

coderd/database/migrations/000299_user_configs.up.sql

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+CREATE TABLE IF NOT EXISTS user_configs (
+	user_id uuid NOT NULL,
+	key varchar(256) NOT NULL,
+	value text NOT NULL,
+
+	PRIMARY KEY (user_id, key),
+	FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
+);
+
+
+-- Copy "theme_preference" from "users" table
+INSERT INTO user_configs (user_id, key, value)
+  SELECT id, 'theme_preference', theme_preference
+    FROM users
+    WHERE users.theme_preference IS NOT NULL;
+
+
+-- Replace "group_members_expanded" without "theme_preference"
+DROP VIEW group_members_expanded;
+-- Taken from 000242_group_members_view.up.sql
+CREATE VIEW
+    group_members_expanded
+AS
+-- If the group is a user made group, then we need to check the group_members table.
+-- If it is the "Everyone" group, then we need to check the organization_members table.
+WITH all_members AS (
+    SELECT user_id, group_id FROM group_members
+    UNION
+    SELECT user_id, organization_id AS group_id FROM organization_members
+)
+SELECT
+    users.id AS user_id,
+    users.email AS user_email,
+    users.username AS user_username,
+    users.hashed_password AS user_hashed_password,
+    users.created_at AS user_created_at,
+    users.updated_at AS user_updated_at,
+    users.status AS user_status,
+    users.rbac_roles AS user_rbac_roles,
+    users.login_type AS user_login_type,
+    users.avatar_url AS user_avatar_url,
+    users.deleted AS user_deleted,
+    users.last_seen_at AS user_last_seen_at,
+    users.quiet_hours_schedule AS user_quiet_hours_schedule,
+    users.name AS user_name,
+    users.github_com_user_id AS user_github_com_user_id,
+    groups.organization_id AS organization_id,
+    groups.name AS group_name,
+    all_members.group_id AS group_id
+FROM
+    all_members
+JOIN
+    users ON users.id = all_members.user_id
+JOIN
+    groups ON groups.id = all_members.group_id
+WHERE
+    users.deleted = 'false';
+
+COMMENT ON VIEW group_members_expanded IS 'Joins group members with user information, organization ID, group name. Includes both regular group members and organization members (as part of the "Everyone" group).';
+
+-- Drop the "theme_preference" column now that the view no longer depends on it.
+ALTER TABLE users DROP COLUMN theme_preference;