WIP: Add a migration for project membmership

Signed-off-by: Nikolai Rodionov <iam@allanger.xyz>

migrations/20260518193057_project_membership_init.down.sql

@@ -0,0 +1,7 @@
+DROP INDEX IF EXISTS idx_project_memberships_project;
+DROP INDEX IF EXISTS idx_project_memberships_user;
+
+DROP TABLE IF EXISTS project_memberships;
+
+DROP TYPE IF EXISTS membership_status;
+DROP TYPE IF EXISTS project_role;

migrations/20260518193057_project_membership_init.up.sql

@@ -0,0 +1,35 @@
+CREATE TYPE project_role AS ENUM (
+    'member',
+    'admin',
+    'owner'
+);
+
+CREATE TYPE membership_status AS ENUM (
+    'invited',
+    'active',
+    'suspended'
+);
+
+CREATE TABLE project_memberships (
+    project_uuid UUID NOT NULL
+        REFERENCES projects(uuid)
+        ON DELETE CASCADE,
+
+    user_uuid UUID NOT NULL
+        REFERENCES accounts(uuid)
+        ON DELETE CASCADE,
+
+    role project_role NOT NULL,
+    status membership_status NOT NULL DEFAULT 'active',
+
+    invited_by UUID NULL
+        REFERENCES accounts(uuid),
+    joined_at TIMESTAMP NULL,
+    PRIMARY KEY (project_uuid, user_uuid)
+);
+
+CREATE INDEX idx_project_memberships_user 
+ON project_memberships(user_uuid); 
+
+CREATE INDEX idx_project_memberships_project 
+ON project_memberships(project_uuid);