add data conversion scripts for PGSQL.

pyweb/mumble/conversionsql/pgsql/01-schema-prepare-mumble.sql

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+-- Model: Mumble
+ALTER TABLE "mumble_mumble"
+        ADD "server_id" integer NULL REFERENCES "mumble_mumbleserver" ("id") DEFERRABLE INITIALLY DEFERRED;
+ALTER TABLE "mumble_mumble"
+        ADD "display" varchar(200);
+
+CREATE INDEX "mumble_mumble_server_id" ON "mumble_mumble" ("server_id");

pyweb/mumble/conversionsql/pgsql/11-data-mumble_mumbleserver.sql

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+INSERT INTO "mumble_mumbleserver" ( "dbus", "secret" )
+SELECT DISTINCT "dbus", ''
+FROM "mumble_mumble";

pyweb/mumble/conversionsql/pgsql/12-data-mumble_mumble.sql

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+UPDATE "mumble_mumble"
+SET "server_id"=(
+  SELECT "id"
+  FROM "mumble_mumbleserver"
+  WHERE "mumble_mumbleserver"."dbus" = "mumble_mumble"."dbus"
+  );

pyweb/mumble/conversionsql/pgsql/21-schema-cleanup-mumble.sql

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+-- Model: Mumble
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "dbus";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "url";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "motd";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "passwd";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "supw";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "users";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "bwidth";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "sslcrt";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "sslkey";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "obfsc";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "player";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "channel";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "defchan";
+ALTER TABLE "mumble_mumble"
+        DROP COLUMN "booted";
+
+ALTER TABLE "mumble_mumble"
+        ALTER COLUMN "server_id" SET NOT NULL;

pyweb/mumble/conversionsql/pgsql/22-schema-cleanup-mumbleuser.sql

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+-- Model: MumbleUser
+ALTER TABLE "mumble_mumbleuser"
+        DROP COLUMN "isAdmin";