Add a field for package base popularity

Create a new field Popularity in the PackageBases table. The field is
updated by the popupdate script and reflects the popularity of a
package. Popularity is the sum of all votes with each vote being
weighted with a factor of 0.98 per day since its creation.
Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

schema/aur-schema.sql

@@ -102,6 +102,7 @@ CREATE TABLE PackageBases (
 	Name VARCHAR(255) NOT NULL,
 	CategoryID TINYINT UNSIGNED NOT NULL DEFAULT 1,
 	NumVotes INTEGER UNSIGNED NOT NULL DEFAULT 0,
+	Popularity DECIMAL(6,2) UNSIGNED NOT NULL DEFAULT 0,
 	OutOfDateTS BIGINT UNSIGNED NULL DEFAULT NULL,
 	SubmittedTS BIGINT UNSIGNED NOT NULL,
 	ModifiedTS BIGINT UNSIGNED NOT NULL,

scripts/popupdate.py

@@ -23,5 +23,10 @@ cur = db.cursor()
 cur.execute("UPDATE PackageBases SET NumVotes = (SELECT COUNT(*) FROM " +
             "PackageVotes WHERE PackageVotes.PackageBaseID = PackageBases.ID)")
 
+cur.execute("UPDATE PackageBases SET Popularity = (" +
+            "SELECT SUM(POWER(0.98, (UNIX_TIMESTAMP() - VoteTS) / 86400)) " +
+            "FROM PackageVotes WHERE PackageVotes.PackageBaseID = " +
+            "PackageBases.ID AND NOT VoteTS IS NULL)")
+
 db.commit()
 db.close()

upgrading/4.0.0.txt

@@ -31,4 +31,11 @@ CREATE TABLE PackageComaintainers (
 ) ENGINE = InnoDB;
 ----
 
-5. (optional) Setup cgit to browse the Git repositories via HTTP.
+5. Add a field for the package base popularity to the PackageBases table:
+
+----
+ALTER TABLE PackageBases
+	ADD COLUMN Popularity DECIMAL(6,2) UNSIGNED NOT NULL DEFAULT 0;
+----
+
+6. (optional) Setup cgit to browse the Git repositories via HTTP.