Build reusable bot framework

config/migrations/0001_core_tables.sql

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+-- Baseline legacy tables and normalize their timestamps as UTC.
+CREATE TABLE IF NOT EXISTS users (
+    id UUID PRIMARY KEY,
+    username VARCHAR(255) UNIQUE NOT NULL,
+    password_hashed BYTEA NOT NULL,
+    timezone VARCHAR(64) NOT NULL DEFAULT 'UTC',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+ALTER TABLE users
+    ADD COLUMN IF NOT EXISTS timezone VARCHAR(64) NOT NULL DEFAULT 'UTC';
+
+CREATE TABLE IF NOT EXISTS notifications (
+    id UUID PRIMARY KEY,
+    user_uuid UUID REFERENCES users(id) ON DELETE CASCADE UNIQUE,
+    discord_webhook VARCHAR(500),
+    discord_enabled BOOLEAN DEFAULT FALSE,
+    ntfy_topic VARCHAR(255),
+    ntfy_enabled BOOLEAN DEFAULT FALSE,
+    last_message_sent TIMESTAMPTZ,
+    current_notification_status VARCHAR(50) DEFAULT 'inactive',
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    updated_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+DO $$
+BEGIN
+    IF EXISTS (
+        SELECT 1 FROM information_schema.columns
+        WHERE table_schema = 'public'
+          AND table_name = 'users'
+          AND column_name = 'created_at'
+          AND data_type = 'timestamp without time zone'
+    ) THEN
+        ALTER TABLE users ALTER COLUMN created_at TYPE TIMESTAMPTZ
+            USING created_at AT TIME ZONE 'UTC';
+    END IF;
+
+    IF EXISTS (
+        SELECT 1 FROM information_schema.columns
+        WHERE table_schema = 'public'
+          AND table_name = 'notifications'
+          AND column_name = 'last_message_sent'
+          AND data_type = 'timestamp without time zone'
+    ) THEN
+        ALTER TABLE notifications ALTER COLUMN last_message_sent TYPE TIMESTAMPTZ
+            USING last_message_sent AT TIME ZONE 'UTC';
+    END IF;
+
+    IF EXISTS (
+        SELECT 1 FROM information_schema.columns
+        WHERE table_schema = 'public'
+          AND table_name = 'notifications'
+          AND column_name = 'created_at'
+          AND data_type = 'timestamp without time zone'
+    ) THEN
+        ALTER TABLE notifications ALTER COLUMN created_at TYPE TIMESTAMPTZ
+            USING created_at AT TIME ZONE 'UTC';
+    END IF;
+
+    IF EXISTS (
+        SELECT 1 FROM information_schema.columns
+        WHERE table_schema = 'public'
+          AND table_name = 'notifications'
+          AND column_name = 'updated_at'
+          AND data_type = 'timestamp without time zone'
+    ) THEN
+        ALTER TABLE notifications ALTER COLUMN updated_at TYPE TIMESTAMPTZ
+            USING updated_at AT TIME ZONE 'UTC';
+    END IF;
+END $$;