add alternate schema to schema/sources

schema/sources.sql

@@ -14,3 +14,22 @@ CREATE TABLE sources (
   first_party BOOLEAN NOT NULL,
   ogl_copyright_block TEXT NOT NULL
 );
+
+CREATE TABLE sourceentries (
+  sourceentries_id INTEGER PRIMARY KEY,
+  sources_id INTEGER NOT NULL,
+  page_start INTEGER,
+  page_stop INTEGER,
+  UNIQUE (sources_id, page_start, page_stop), -- prevent duplicates
+  FOREIGN KEY (sources_id) REFERENCES sources(sources_id)
+);
+
+CREATE TABLE monsters_sourceentries (
+  id INTEGER PRIMARY KEY,
+  monsters_id INTEGER NOT NULL,
+  sourceentries_id INTEGER NOT NULL,
+  FOREIGN KEY (monsters_id) REFERENCES monsters(monsters_id),
+  FOREIGN KEY (sourceentries_id_id) REFERENCES sourceentries_id(sourceentries_id_id)
+);
+
+-- TODO add in new many-to-many tables for the various things we want to have sources be listed this way