Schema Version 1.4 (Collections)

Added Collections for Art
Added art_collections for assigning art to collections

Create_DB.sql

@@ -1,12 +1,13 @@
 -- Creating the DB structure
--- Version 1.3 (2021-08-14)
+-- Version 1.4 (2021-10-10)
 
 CREATE TABLE IF NOT EXISTS Art (
     ID INTEGER PRIMARY KEY generated always as identity,
     md5_hash CHAR(32) NOT NULL UNIQUE,
     path VARCHAR NOT NULL UNIQUE,
     title VARCHAR,
-    link VARCHAR
+    link VARCHAR,
+    description VARCHAR
 );
 
 CREATE TABLE IF NOT EXISTS Artist (
@@ -29,6 +30,21 @@ CREATE TABLE IF NOT EXISTS Presence (
     FOREIGN KEY (artist_ID) REFERENCES Artist(ID) ON DELETE CASCADE
 );
 
+CREATE TABLE IF NOT EXISTS Collection (  -- for ordered lists of art
+    ID INTEGER PRIMARY KEY generated always as identity,
+    name VARCHAR,
+    description VARCHAR
+);
+
+CREATE TABLE IF NOT EXISTS Art_Collection (
+    collection_ID INTEGER NOT NULL,
+    art_ID INTEGER NOT NULL,
+    ranking VARCHAR,  -- order in the collection by string value, allows easy insert see https://stackoverflow.com/questions/9536262/best-representation-of-an-ordered-list-in-a-database; same rank or empty rank means unordered
+    PRIMARY KEY (collection_ID, art_ID),
+    FOREIGN KEY (collection_ID) REFERENCES Collection(ID) ON DELETE CASCADE,
+    FOREIGN KEY (art_ID) REFERENCES Art(ID)
+);
+
 CREATE TABLE IF NOT EXISTS Art_Author (
     presence_name CHAR(20) NOT NULL,
     presence_domain CHAR(20) NOT NULL,
@@ -88,7 +104,7 @@ GRANT CONNECT ON
     DATABASE artnet
     TO artnet_editor;
 GRANT SELECT, INSERT, UPDATE, DELETE ON
-    TABLE art, art_author, tag_category, art_tag, artist_topic, artist, presence, tag, tag_alias, tag_implication, topic
+    TABLE art, art_author, tag_category, art_tag, artist_topic, artist, presence, tag, tag_alias, tag_implication, topic, collection, art_collection
     TO artnet_editor;
 
 GRANT USAGE ON