many changes

Hentai_create.sql

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+CREATE TABLE artist (
+    id integer NOT NULL CONSTRAINT artist_pk PRIMARY KEY AUTOINCREMENT,
+    name text NOT NULL
+);
+
+CREATE TABLE links (
+    id integer NOT NULL CONSTRAINT links_pk PRIMARY KEY AUTOINCREMENT,
+    url text NOT NULL,
+    website_id integer NOT NULL,
+    artist_id integer NOT NULL,
+    CONSTRAINT links_artist FOREIGN KEY (artist_id)
+    REFERENCES artist (id),
+    CONSTRAINT links_website FOREIGN KEY (website_id)
+    REFERENCES website (id)
+);
+
+CREATE TABLE website (
+    id integer NOT NULL CONSTRAINT website_pk PRIMARY KEY AUTOINCREMENT,
+    name text NOT NULL
+);