Deploys new database migration script, closes#1

.gitignore

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 .DS_Store
-.nova
+.env
+docks
+scratch.json

.nova/Configuration.json

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+{
+  "workspace.art_style" : 1,
+  "workspace.color" : 10,
+  "workspace.name" : "GovA11y Postgres"
+}

migrations/005.sql

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+-- Migration: 005
+-- ------------------------------
+-- Hasura
+-- ------------------------------
+-- Create the 'hasura' user with password 'SecretsOfHasura'
+CREATE USER hasura WITH PASSWORD 'SecretsOfHasura';
+
+-- Create the 'hasura'database
+CREATE DATABASE hasura;
+
+-- Grant all privileges on the 'hasura' and 'gova11y' databases to the 'hasura' user
+GRANT ALL PRIVILEGES ON DATABASE hasura TO hasura;
+GRANT ALL PRIVILEGES ON DATABASE gova11y TO hasura;
+
+ALTER USER hasura WITH PASSWORD 'SecretsOfHasura';
+
+-- ------------------------------
+-- Add URLs & Sitemaps
+-- ------------------------------
+-- Insert GovA11y Homepage
+INSERT INTO targets.urls (url, domain_id)
+VALUES
+('https://gova11y.io/', 1);
+
+-- ------------------------------
+-- Fix Sitemap Table
+-- ------------------------------
+
+-- Step 1: Add a new column to hold the foreign key to the targets.urls table
+ALTER TABLE targets.sitemaps
+ADD COLUMN IF NOT EXISTS url_id bigint;
+
+-- Step 2: Add a foreign key constraint to establish the relationship between the two tables
+ALTER TABLE targets.sitemaps
+ADD CONSTRAINT sitemaps_fk_url
+FOREIGN KEY (url_id) REFERENCES targets.urls(id);
+
+-- Step 3: Creating an index on the new url_id column to speed up queries
+CREATE INDEX IF NOT EXISTS idx_sitemaps_url_id ON targets.sitemaps USING btree (url_id);
+
+-- Step 4: Data Migration: Mapping sitemap_url to url_id
+WITH url_inserts AS (
+    INSERT INTO targets.urls (url, domain_id)
+    SELECT DISTINCT sitemap_url, domain_id FROM targets.sitemaps
+    ON CONFLICT (url) DO NOTHING
+    RETURNING id, url
+)
+UPDATE targets.sitemaps s
+SET url_id = u.id
+FROM url_inserts u
+WHERE s.sitemap_url = u.url;
+
+
+-- Step 5: Drop the sitemap_url column since we are using url_id
+ALTER TABLE targets.sitemaps
+DROP COLUMN sitemap_url;
+
+
+-- ------------------------------
+-- Create Sitemap Insertion Function
+-- ------------------------------
+
+CREATE OR REPLACE FUNCTION targets.insert_sitemap(
+    sitemap_url TEXT,
+    domain_id INT4,
+    last_modified timestamptz DEFAULT NULL,
+    change_frequency TEXT DEFAULT NULL,
+    priority FLOAT4 DEFAULT NULL
+)
+RETURNS void LANGUAGE plpgsql AS $$
+DECLARE
+    url_id bigint;
+BEGIN
+    -- Step 1: Insert the URL into the targets.urls table and get the ID or do nothing if it already exists
+    INSERT INTO targets.urls (url, domain_id)
+    VALUES (sitemap_url, domain_id)
+    ON CONFLICT (url)
+    DO UPDATE
+    SET url = excluded.url
+    RETURNING id INTO url_id;
+
+    -- Step 2: Insert a new record into the targets.sitemaps table with the ID of the URL and the other details
+    INSERT INTO targets.sitemaps (url_id, domain_id, last_modified, change_frequency, priority)
+    VALUES (url_id, domain_id, last_modified, change_frequency, priority)
+    ON CONFLICT (url_id)
+    DO NOTHING;
+END $$;
+
+
+-- Insert some of the GovA11y Sitemaps
+SELECT targets.insert_sitemap('https://gova11y.io/sitemap-pages.xml', 1, '2023-09-12 22:32:00');
+SELECT targets.insert_sitemap('https://gova11y.io/sitemap-authors.xml', 1, '2023-09-12 22:03:00');
+SELECT targets.insert_sitemap('https://gova11y.io/sitemap-tags.xml', 1, '2023-09-08 04:37:00');
+
+
+