Domain64 and DB backing tested

internal/domain64/sqlc/schema.sql

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+CREATE TABLE IF NOT EXISTS tlds (
+  tld_id INTEGER PRIMARY KEY NOT NULL,
+  tld TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS domains (
+  id INTEGER PRIMARY KEY,
+  tld_id INTEGER NOT NULL REFERENCES tlds(tld_id),
+  domain_id INTEGER NOT NULL,
+  domain TEXT NOT NULL
+);
+CREATE UNIQUE INDEX IF NOT EXISTS ndx_domains_uniq ON domains(tld_id, domain_id);
+
+
+CREATE TABLE IF NOT EXISTS subdomains (
+  id INTEGER PRIMARY KEY,
+  tld_id INTEGER NOT NULL REFERENCES tlds(tld_id),
+  domain_id INTEGER NOT NULL REFERENCES domains(domain_id),
+  subdomain_id INTEGER NOT NULL,
+  subdomain TEXT NOT NULL
+);
+CREATE UNIQUE INDEX IF NOT EXISTS ndx_subdomains_uniq ON subdomains(tld_id, domain_id, subdomain_id);
+
+CREATE TABLE IF NOT EXISTS paths (
+  id INTEGER PRIMARY KEY,
+  tld_id INTEGER NOT NULL REFERENCES tlds(tld_id),
+  domain_id INTEGER NOT NULL REFERENCES domains(domain_id),
+  subdomain_id INTEGER NOT NULL REFERENCES subdomains(subdomain_id),
+  path_id INTEGER NOT NULL,
+  path TEXT NOT NULL
+);
+CREATE UNIQUE INDEX IF NOT EXISTS ndx_paths_uniq ON paths(tld_id, domain_id, subdomain_id, path_id);
+
+
+CREATE TABLE IF NOT EXISTS domain64 (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  rfqdn TEXT,
+  d64 BIGINT UNIQUE NOT NULL
+);