CREATE TABLE IF NOT EXISTS "projects" (    "id" SERIAL PRIMARY KEY,    "host_user_id" INTEGER REFERENCES users (id) NOT NULL,    "unregistered" BOOLEAN NOT NULL DEFAULT false); CREATE TABLE IF NOT EXISTS "worktree_extensions" (    "id" SERIAL PRIMARY KEY,    "project_id" INTEGER REFERENCES projects (id) NOT NULL,    "worktree_id" INTEGER NOT NULL,    "extension" VARCHAR(255),    "count" INTEGER NOT NULL); CREATE TABLE IF NOT EXISTS "project_activity_periods" (    "id" SERIAL PRIMARY KEY,    "duration_millis" INTEGER NOT NULL,    "ended_at" TIMESTAMP NOT NULL,    "user_id" INTEGER REFERENCES users (id) NOT NULL,    "project_id" INTEGER REFERENCES projects (id) NOT NULL); CREATE INDEX "index_project_activity_periods_on_ended_at" ON "project_activity_periods" ("ended_at");CREATE UNIQUE INDEX "index_worktree_extensions_on_project_id_and_worktree_id_and_extension" ON "worktree_extensions" ("project_id", "worktree_id", "extension");