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CREATE TABLE #output (
  DbName VARCHAR(MAX),
  ElectionId INT,
  PostId INT,
  CreationDate DATETIME,
  UserName VARCHAR(MAX),
  UserId INT,
  UserAccountId INT
);

DECLARE @query VARCHAR(MAX);

DECLARE dbcursor CURSOR FOR
SELECT name
FROM sysdatabases
WHERE name NOT IN ('master', 'tempdb', 'model' ,'msdb', 'Data.StackExchange');

DECLARE @DbName VARCHAR(MAX);

OPEN dbcursor;
FETCH NEXT FROM dbcursor INTO @dbname;

WHILE @@FETCH_STATUS = 0
BEGIN
  SELECT @query = '
    WITH Raw AS (
      SELECT
        LAG(CreationDate) OVER (ORDER BY CreationDate) AS PrevCrDate,
        Id,
        OwnerUserId AS UserId,
        CreationDate
      FROM [' + @dbname + '].dbo.PostsWithDeleted
      WHERE PostTypeId = 6
    )
    SELECT
      ''' + @dbname + ''' AS DbName,
      SUM(
        CASE
          WHEN
            PrevCrDate IS NULL
            OR
            DATEDIFF(day, Raw.PrevCrDate, Raw.CreationDate) > 30
          THEN
            1
          ELSE 0
        END
      ) OVER (
        ORDER BY Raw.CreationDate
        ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
      ) AS ElectionId,
      Raw.Id AS PostId,
      Raw.CreationDate,
      Users.DisplayName AS UserName,
      Raw.UserId,
      Users.AccountId AS UserAccountId
    FROM Raw
    LEFT JOIN [' + @dbname + '].dbo.Users ON Raw.UserId = Users.Id
    ';
  INSERT INTO #output EXEC (@query);
  FETCH NEXT FROM dbcursor INTO @DbName;
END

CLOSE dbcursor;

SELECT
  *,
  COUNT(*) OVER (PARTITION BY UserAccountId) AS UserNominationCount
FROM #output ORDER BY CreationDate;

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edited aug 23 19

created aug 14 19 peterh - PLEASE DELETE THIS ACCOUNT