Build reusable bot framework

modules/reminders/migrations/0001_reminders.sql

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+CREATE TABLE IF NOT EXISTS reminders (
+    id UUID PRIMARY KEY,
+    user_uuid UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    message TEXT NOT NULL,
+    timezone VARCHAR(64) NOT NULL,
+    recurrence JSONB,
+    next_run_at TIMESTAMPTZ NOT NULL,
+    status VARCHAR(20) NOT NULL DEFAULT 'active',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    completed_at TIMESTAMPTZ,
+    cancelled_at TIMESTAMPTZ,
+    CONSTRAINT reminders_status_check
+        CHECK (status IN ('active', 'completed', 'cancelled')),
+    CONSTRAINT reminders_recurrence_check
+        CHECK (recurrence IS NULL OR jsonb_typeof(recurrence) = 'object')
+);
+
+CREATE INDEX IF NOT EXISTS reminders_user_active_idx
+    ON reminders (user_uuid, next_run_at)
+    WHERE status = 'active';