What's Missing in Standard FastAPI + LangChain + PostgreSQL Architecture
Without an infrastructure layer listening to PostgreSQL events, you rely on manual cron jobs or messy webhooks to track when users reach their first value milestone. Most setups require custom code to detect activation.
Standard FastAPI + LangChain + PostgreSQL Flow vs Optimized Skene Flow
User signs up via authentication
User record created in PostgreSQL
No automatic trigger - manual follow-up required
Watch PostgreSQL 'users' table for new signups using CREATE TRIGGER
Detect when user completes first key action (e.g., creating their first project) using PostgreSQL queries
Trigger activation email sequence via Resend with personalized onboarding
Track activation completion and send milestone emails
Visual comparison of the flows:
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How Skene Fixes This
This Skene Prompt installs activation detection into FastAPI + LangChain + PostgreSQL by watching PostgreSQL tables for key user actions. When users complete their first value milestone like creating their first project, it triggers welcome sequences and feature discovery emails.
Implementation Comparison
Using Skene Infrastructure
Install via Prompt
@task: Initialize Skene.
@action: Analyze my local code, validating subscription via `npx skene login`, and generate `skene.config.ts` to implement the Activation Loop pattern for FastAPI + LangChain + PostgreSQL.Copy Skene Prompt for Cursor
Generated skene.config.ts
// skene.config.ts - The Automated Way
import { defineLoop } from '@skene/sdk';
export default defineLoop({
type: 'activation',
opinion: 'Detect when users complete their first key action and trigger personalized onboarding',
steps: [
{
trigger: {
type: 'database',
table: 'users',
event: 'insert'
},
condition: {
type: 'query',
query: `SELECT * FROM user_actions WHERE user_id = $1 AND action_type = 'first_project_created'`,
timeout: '5m'
},
action: {
type: 'email',
provider: 'resend',
template: 'activation_welcome',
personalization: {
name: '{{user.name}}',
activationLink: '{{user.activation_link}}'
}
}
}
],
recovery: {
retries: 3,
backoff: 'exponential'
}
});