Update DB init instructions & README

db/sql/initdb.sql

@@ -0,0 +1,35 @@
+DROP TABLE IF EXISTS snapshots;
+
+CREATE TABLE snapshots (
+    id SERIAL PRIMARY KEY,
+    url TEXT NOT NULL UNIQUE,
+    host TEXT NOT NULL,
+    timestamp TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    mimetype TEXT,
+    data BYTEA,
+    gemtext TEXT,
+    links JSONB,
+    lang TEXT,
+    response_code INTEGER,
+    error TEXT
+);
+
+CREATE INDEX idx_url ON snapshots (url);
+CREATE INDEX idx_timestamp ON snapshots (timestamp);
+CREATE INDEX idx_mimetype ON snapshots (mimetype);
+CREATE INDEX idx_lang ON snapshots (lang);
+CREATE INDEX idx_response_code ON snapshots (response_code);
+CREATE INDEX idx_error ON snapshots (error);
+CREATE INDEX idx_host ON snapshots (host);
+CREATE INDEX unique_uid_url ON snapshots (uid, url);
+CREATE INDEX idx_response_code_error_nulls ON snapshots (response_code, error) WHERE response_code IS NULL AND error IS NULL;
+
+CREATE TABLE urls (
+                      id SERIAL PRIMARY KEY,
+                      url TEXT NOT NULL UNIQUE,
+                      host TEXT NOT NULL,
+                      timestamp TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+CREATE INDEX idx_urls_url ON urls (url);
+CREATE INDEX idx_urls_timestamp ON urls (timestamp);
+