implement core foundation

go/migrations/000013_network_billing.down.sql

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+DROP TABLE IF EXISTS network_subscriptions;
+DROP TABLE IF EXISTS network_stripe_customers;

go/migrations/000013_network_billing.up.sql

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+CREATE TABLE network_stripe_customers (
+  network_id         TEXT PRIMARY KEY,
+  stripe_customer_id TEXT NOT NULL UNIQUE,
+  created_at         TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE network_subscriptions (
+  id                     TEXT        PRIMARY KEY,
+  network_id             TEXT        NOT NULL REFERENCES network_stripe_customers(id) ON DELETE CASCADE,
+  stripe_customer_id     TEXT        NOT NULL,
+  status                 TEXT        NOT NULL,
+  price_id               TEXT        NOT NULL,
+  cadence                TEXT        NOT NULL,
+  quantity               INT         NOT NULL,
+  cancel_at_period_end   BOOLEAN     NOT NULL DEFAULT FALSE,
+  current_period_start   TIMESTAMPTZ NOT NULL,
+  current_period_end     TIMESTAMPTZ NOT NULL,
+  created_at             TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at             TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  CONSTRAINT network_subscriptions_cadence_check CHECK (cadence IN ('monthly', 'annual'))
+);
+
+CREATE UNIQUE INDEX idx_network_subscriptions_network_id
+  ON network_subscriptions (network_id);