Harvest email addresses from messages.

Go tool for reading original messages from DB and filling out contact table.
SQL scripts for building address book table from most commonly referenced
    names per unique email address.

pg/fill-abook.sql

@@ -0,0 +1,31 @@
+DROP TABLE abook;
+
+CREATE TABLE
+    abook (count, name, address)
+AS SELECT
+    DISTINCT ON(lower(address))
+    named.count,
+    named.name || lower(unnamed.address),
+    lower(unnamed.address)
+FROM
+    contact unnamed
+LEFT OUTER JOIN (
+    SELECT
+        DISTINCT ON (lower(address))
+        count(name),
+        name,
+        lower(address) AS laddr
+    FROM
+        contact
+    WHERE
+        name != ''
+    GROUP BY
+        lower(address), name
+    ORDER BY
+        lower(address),
+        count DESC,
+        name
+) named
+ON
+    named.laddr = lower(unnamed.address)
+;

pg/init-contact.sql

@@ -0,0 +1,7 @@
+DROP TABLE contact;
+
+CREATE TABLE contact (
+    hash CHAR(40) REFERENCES original (hash),
+    name TEXT,
+    address TEXT
+);