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+
+## 2020-06-23
+
+Where do back ISSN-Ls come from? Answer: exiting fatcat metadata.
+
+    select count(*) from journal where valid_issnl = 0;
+    => 4
+
+    select count(*) from journal where known_issnl = 0;
+    => 2304
+
+    select directory.slug, count(*) from journal join directory on journal.issnl = directory.issnl where journal.known_issnl = 0 group by directory.slug order by count(*) desc limit 20;
+
+    select count(*) from journal join fatcat_container on journal.issnl = fatcat_container.issnl where journal.known_issnl = 0;
+    => 2,328
+    => note: still a few dupe ISSN-L in fatcat_container
+
+
+How many journals might be longtail but have just a handful of DOIs? And would
+be lost if we filter by `has_doi=0`?
+
+    select count(*) from journal where has_dois = 1 and release_count <= 10;
+    9054
+
+    select count(*) from journal where has_dois = 1 and is_longtail = 1;
+    15,575
+
+    select count(*) from journal where has_dois = 1 and (is_active is null or is_active = 1) and release_count <= 10 and any_homepage = 1;
+    => 5,843
+
+How many *journals* would old query turn up? NOTE: have not verified new homepage URLs
+
+    SELECT COUNT(DISTINCT journal.issnl), COUNT(DISTINCT homepage.url)
+    FROM homepage
+    LEFT JOIN journal ON homepage.issnl = journal.issnl
+    WHERE
+        homepage.terminal_status_code = 200
+        AND journal.is_longtail = 1
+        AND homepage.domain != 'archive.org'
+        AND homepage.host NOT LIKE '%scielo%'
+        AND homepage.domain != 'jst.go.jp'
+        AND homepage.host != 'books.google.com'
+        AND homepage.host != 'www.google.com'
+        AND journal.has_dois = 0;
+    => 16,471 journals
+    => 19,460 URLs
+
+New tweaks:
+
+    SELECT COUNT(DISTINCT journal.issnl), COUNT(DISTINCT homepage.url)
+    FROM homepage
+    LEFT JOIN journal ON homepage.issnl = journal.issnl
+    WHERE
+        (homepage.terminal_status_code = 200 or homepage.blocked or homepage.terminal_status_code is null)
+        AND homepage.domain != 'archive.org'
+        AND homepage.host NOT LIKE '%scielo%'
+        AND homepage.domain != 'jst.go.jp'
+        AND homepage.host != 'books.google.com'
+        AND homepage.host != 'www.google.com'
+        AND homepage.domain != 'oclc.org'
+        AND homepage.host != 'www.ncbi.nlm.nih.gov'
+        AND homepage.domain != 'umi.com'
+        AND homepage.domain != 'doi.org'
+        AND homepage.host != 'www.thefreelibrary.com'
+        AND (journal.is_longtail = 1
+            OR journal.publisher_type = 'society'
+            OR journal.publisher_type = 'unipress' 
+            OR journal.publisher_type IS NULL)
+        AND (journal.has_dois = 0 or journal.release_count < 20);
+    => 57,637 journals
+    => 70,770 homepages
+
+This is a significant increase in size over previous crawls!
+