DbStructure JSON SQL query

dbstructure.sh

test/with_tmp_db psql -f dbstructure.sql | sed -n '4p' | jq . > out.json

dbstructure.sql

-- SQL query for the structure of the database. This query defines what
-- PostgREST 'sees' in your database.
prepare dbstructure as
  with

-- getDbStructure :: [Schema] -> PgVersion -> HT.Transaction DbStructure
-- getDbStructure schemas pgVer = do
--   HT.sql "set local schema ''" -- This voids the search path. The following queries need this for getting the fully qualified name(schema.name) of every db object
--   tabs    <- HT.statement () allTables
--   cols    <- HT.statement schemas $ allColumns tabs
--   srcCols <- HT.statement schemas $ allSourceColumns cols pgVer
--   m2oRels <- HT.statement () $ allM2ORels tabs cols
--   keys    <- HT.statement () $ allPrimaryKeys tabs
--   procs   <- HT.statement schemas allProcs
--
--   let rels = addM2MRels . addO2MRels $ addViewM2ORels srcCols m2oRels
--       cols' = addForeignKeys rels cols
--       keys' = addViewPrimaryKeys srcCols keys
--
--   return DbStructure {
--       dbTables = tabs
--     , dbColumns = cols'
--     , dbRelations = rels
--     , dbPrimaryKeys = keys'
--     , dbProcs = procs
--     , pgVersion = pgVer
--     }
--
-- decodeTables :: HD.Result [Table]
-- decodeTables =
--   HD.rowList tblRow
--  where
--   tblRow = Table <$> column HD.text
--                  <*> column HD.text
--                  <*> nullableColumn HD.text
--                  <*> column HD.bool
--
-- decodeColumns :: [Table] -> HD.Result [Column]
-- decodeColumns tables =
--   mapMaybe (columnFromRow tables) <$> HD.rowList colRow
--  where
--   colRow =
--     (,,,,,,,,,,,)
--       <$> column HD.text <*> column HD.text
--       <*> column HD.text <*> nullableColumn HD.text
--       <*> column HD.int4 <*> column HD.bool
--       <*> column HD.text <*> column HD.bool
--       <*> nullableColumn HD.int4
--       <*> nullableColumn HD.int4
--       <*> nullableColumn HD.text
--       <*> nullableColumn HD.text
--
-- decodeRels :: [Table] -> [Column] -> HD.Result [Relation]
-- decodeRels tables cols =
--   mapMaybe (relFromRow tables cols) <$> HD.rowList relRow
--  where
--   relRow = (,,,,,,)
--     <$> column HD.text
--     <*> column HD.text
--     <*> column HD.text
--     <*> column (HD.array (HD.dimension replicateM (element HD.text)))
--     <*> column HD.text
--     <*> column HD.text
--     <*> column (HD.array (HD.dimension replicateM (element HD.text)))
--
-- decodePks :: [Table] -> HD.Result [PrimaryKey]
-- decodePks tables =
--   mapMaybe (pkFromRow tables) <$> HD.rowList pkRow
--  where
--   pkRow = (,,) <$> column HD.text <*> column HD.text <*> column HD.text
--
-- decodeSourceColumns :: [Column] -> HD.Result [SourceColumn]
-- decodeSourceColumns cols =
--   mapMaybe (sourceColumnFromRow cols) <$> HD.rowList srcColRow
--  where
--   srcColRow = (,,,,,)
--     <$> column HD.text <*> column HD.text
--     <*> column HD.text <*> column HD.text
--     <*> column HD.text <*> column HD.text
--
-- sourceColumnFromRow :: [Column] -> (Text,Text,Text,Text,Text,Text) -> Maybe SourceColumn
-- sourceColumnFromRow allCols (s1,t1,c1,s2,t2,c2) = (,) <$> col1 <*> col2
--   where
--     col1 = findCol s1 t1 c1
--     col2 = findCol s2 t2 c2
--     findCol s t c = find (\col -> (tableSchema . colTable) col == s && (tableName . colTable) col == t && colName col == c) allCols
--
-- decodeProcs :: HD.Result ProcsMap
-- decodeProcs =
--   -- Duplicate rows for a function means they're overloaded, order these by least args according to ProcDescription Ord instance
--   map sort . M.fromListWith (++) . map ((\(x,y) -> (x, [y])) . addKey) <$> HD.rowList procRow
--   where
--     procRow = ProcDescription
--               <$> column HD.text
--               <*> column HD.text
--               <*> nullableColumn HD.text
--               <*> (parseArgs <$> column HD.text)
--               <*> (parseRetType
--                   <$> column HD.text
--                   <*> column HD.text
--                   <*> column HD.bool
--                   <*> column HD.char)
--               <*> (parseVolatility <$> column HD.char)
--
--     addKey :: ProcDescription -> (QualifiedIdentifier, ProcDescription)
--     addKey pd = (QualifiedIdentifier (pdSchema pd) (pdName pd), pd)
--
--     parseArgs :: Text -> [PgArg]
--     parseArgs = mapMaybe parseArg . filter (not . isPrefixOf "OUT" . toS) . map strip . split (==',')
--
--     parseArg :: Text -> Maybe PgArg
--     parseArg a =
--       let arg = lastDef "" $ splitOn "INOUT " a
--           (body, def) = breakOn " DEFAULT " arg
--           (name, typ) = breakOn " " body in
--       if T.null typ
--          then Nothing
--          else Just $
--            PgArg (dropAround (== '"') name) (strip typ) (T.null def)
--
--     parseRetType :: Text -> Text -> Bool -> Char -> RetType
--     parseRetType schema name isSetOf typ
--       | isSetOf   = SetOf pgType
--       | otherwise = Single pgType
--       where
--         qi = QualifiedIdentifier schema name
--         pgType = case typ of
--           'c' -> Composite qi
--           'p' -> if name == "record" -- Only pg pseudo type that is a row type is 'record'
--                    then Composite qi
--                    else Scalar qi
--           _   -> Scalar qi -- 'b'ase, 'd'omain, 'e'num, 'r'ange
--
--     parseVolatility :: Char -> ProcVolatility
--     parseVolatility v | v == 'i' = Immutable
--                       | v == 's' = Stable
--                       | otherwise = Volatile -- only 'v' can happen here
--
-- allProcs :: H.Statement [Schema] ProcsMap
-- allProcs = H.Statement (toS sql) (arrayParam HE.text) decodeProcs True
--   where
--     sql = procsSqlQuery <> " WHERE pn.nspname = ANY($1)"
--
-- accessibleProcs :: H.Statement Schema ProcsMap
-- accessibleProcs = H.Statement (toS sql) (param HE.text) decodeProcs True
--   where
--     sql = procsSqlQuery <> " WHERE pn.nspname = $1 AND has_function_privilege(p.oid, 'execute')"
--
-- procsSqlQuery :: SqlQuery
-- procsSqlQuery = [q|
  procs as (
    SELECT
      pn.nspname as proc_schema,
      p.proname as proc_name,
      d.description as proc_description,
      pg_get_function_arguments(p.oid) as args,
      tn.nspname as rettype_schema,
      coalesce(comp.relname, t.typname) as rettype_name,
      p.proretset as rettype_is_setof,
      t.typtype as rettype_typ,
      p.provolatile
    FROM pg_proc p
      JOIN pg_namespace pn ON pn.oid = p.pronamespace
      JOIN pg_type t ON t.oid = p.prorettype
      JOIN pg_namespace tn ON tn.oid = t.typnamespace
      LEFT JOIN pg_class comp ON comp.oid = t.typrelid
      LEFT JOIN pg_catalog.pg_description as d on d.objoid = p.oid
    WHERE
      pn.nspname NOT IN ('pg_catalog', 'information_schema')
  ),
--
-- schemaDescription :: H.Statement Schema (Maybe Text)
-- schemaDescription =
--     H.Statement sql (param HE.text) (join <$> HD.rowMaybe (nullableColumn HD.text)) True
--   where
--     sql = [q|
  schema_description as (
      select
        description
      from
        pg_catalog.pg_namespace n
        left join pg_catalog.pg_description d on d.objoid = n.oid
      where
        n.nspname = $1
  ),

-- accessibleTables :: H.Statement Schema [Table]
-- accessibleTables =
--   H.Statement sql (param HE.text) decodeTables True
--  where
--   sql = [q|
  accessible_tables as (
      select
       n.nspname as table_schema,
       relname as table_name,
       d.description as table_description,
       (
         c.relkind in ('r', 'v', 'f')
         and (pg_relation_is_updatable(c.oid::regclass, false) & 8) = 8
         -- The function `pg_relation_is_updateable` returns a bitmask where 8
         -- corresponds to `1 << CMD_INSERT` in the PostgreSQL source code, i.e.
         -- it's possible to insert into the relation.
         or (exists (
           select 1
           from pg_trigger
           where
             pg_trigger.tgrelid = c.oid
             and (pg_trigger.tgtype::integer & 69) = 69)
             -- The trigger type `tgtype` is a bitmask where 69 corresponds to
             -- TRIGGER_TYPE_ROW + TRIGGER_TYPE_INSTEAD + TRIGGER_TYPE_INSERT
             -- in the PostgreSQL source code.
         )
       ) as insertable
     from
       pg_class c
       join pg_namespace n on n.oid = c.relnamespace
       left join pg_catalog.pg_description as d on d.objoid = c.oid and d.objsubid = 0
     where
       c.relkind in ('v', 'r', 'm', 'f')
       and n.nspname = $1
       and (
         pg_has_role(c.relowner, 'USAGE')
         or has_table_privilege(c.oid, 'SELECT, INSERT, UPDATE, DELETE, TRUNCATE, REFERENCES, TRIGGER')
         or has_any_column_privilege(c.oid, 'SELECT, INSERT, UPDATE, REFERENCES')
       )
     order by relname
  ),
--
-- addForeignKeys :: [Relation] -> [Column] -> [Column]
-- addForeignKeys rels = map addFk
--   where
--     addFk col = col { colFK = fk col }
--     fk col = find (lookupFn col) rels >>= relToFk col
--     lookupFn :: Column -> Relation -> Bool
--     lookupFn c Relation{relColumns=cs, relType=rty} = c `elem` cs && rty==M2O
--     relToFk col Relation{relColumns=cols, relFColumns=colsF} = do
--       pos <- L.elemIndex col cols
--       colF <- atMay colsF pos
--       return $ ForeignKey colF
--
-- {-
-- Adds Views M2O Relations based on SourceColumns found, the logic is as follows:
--
-- Having a Relation{relTable=t1, relColumns=[c1], relFTable=t2, relFColumns=[c2], relType=M2O} represented by:
--
-- t1.c1------t2.c2
--
-- When only having a t1_view.c1 source column, we need to add a View-Table M2O Relation
--
--          t1.c1----t2.c2         t1.c1----------t2.c2
--                          ->            ________/
--                                       /
--       t1_view.c1             t1_view.c1
--
--
-- When only having a t2_view.c2 source column, we need to add a Table-View M2O Relation
--
--          t1.c1----t2.c2               t1.c1----------t2.c2
--                                ->          \________
--                                                     \
--                     t2_view.c2                      t2_view.c1
--
-- When having t1_view.c1 and a t2_view.c2 source columns, we need to add a View-View M2O Relation in addition to the prior
--
--          t1.c1----t2.c2               t1.c1----------t2.c2
--                                ->          \________/
--                                            /        \
--     t1_view.c1     t2_view.c2     t1_view.c1-------t2_view.c1
--
-- The logic for composite pks is similar just need to make sure all the Relation columns have source columns.
-- -}
-- addViewM2ORels :: [SourceColumn] -> [Relation] -> [Relation]
-- addViewM2ORels allSrcCols = concatMap (\rel ->
--   rel : case rel of
--     Relation{relType=M2O, relTable, relColumns, relConstraint, relFTable, relFColumns} ->
--
--       let srcColsGroupedByView :: [Column] -> [[SourceColumn]]
--           srcColsGroupedByView relCols = L.groupBy (\(_, viewCol1) (_, viewCol2) -> colTable viewCol1 == colTable viewCol2) $
--                                          filter (\(c, _) -> c `elem` relCols) allSrcCols
--           relSrcCols = srcColsGroupedByView relColumns
--           relFSrcCols = srcColsGroupedByView relFColumns
--           getView :: [SourceColumn] -> Table
--           getView = colTable . snd . unsafeHead
--           srcCols `allSrcColsOf` cols = S.fromList (fst <$> srcCols) == S.fromList cols
--           -- Relation is dependent on the order of relColumns and relFColumns to get the join conditions right in the generated query.
--           -- So we need to change the order of the SourceColumns to match the relColumns
--           -- TODO: This could be avoided if the Relation type is improved with a structure that maintains the association of relColumns and relFColumns
--           srcCols `sortAccordingTo` cols = sortOn (\(k, _) -> L.lookup k $ zip cols [0::Int ..]) srcCols
--
--           viewTableM2O =
--             [ Relation (getView srcCols) (snd <$> srcCols `sortAccordingTo` relColumns)
--                        relConstraint relFTable relFColumns
--                        M2O Nothing
--             | srcCols <- relSrcCols, srcCols `allSrcColsOf` relColumns ]
--
--           tableViewM2O =
--             [ Relation relTable relColumns
--                        relConstraint
--                        (getView fSrcCols) (snd <$> fSrcCols `sortAccordingTo` relFColumns)
--                        M2O Nothing
--             | fSrcCols <- relFSrcCols, fSrcCols `allSrcColsOf` relFColumns ]
--
--           viewViewM2O =
--             [ Relation (getView srcCols) (snd <$> srcCols `sortAccordingTo` relColumns)
--                        relConstraint
--                        (getView fSrcCols) (snd <$> fSrcCols `sortAccordingTo` relFColumns)
--                        M2O Nothing
--             | srcCols  <- relSrcCols, srcCols `allSrcColsOf` relColumns
--             , fSrcCols <- relFSrcCols, fSrcCols `allSrcColsOf` relFColumns ]
--
--       in viewTableM2O ++ tableViewM2O ++ viewViewM2O
--
--     _ -> [])
--
-- addO2MRels :: [Relation] -> [Relation]
-- addO2MRels = concatMap (\rel@(Relation t c cn ft fc _ _) -> [rel, Relation ft fc cn t c O2M Nothing])
--
-- addM2MRels :: [Relation] -> [Relation]
-- addM2MRels rels = rels ++ addMirrorRel (mapMaybe junction2Rel junctions)
--   where
--     junctions = join $ map (combinations 2) $ filter (not . null) $ groupWith groupFn $ filter ( (==M2O). relType) rels
--     groupFn :: Relation -> Text
--     groupFn Relation{relTable=Table{tableSchema=s, tableName=t}} = s <> "_" <> t
--     -- Reference : https://wiki.haskell.org/99_questions/Solutions/26
--     combinations :: Int -> [a] -> [[a]]
--     combinations 0 _  = [ [] ]
--     combinations n xs = [ y:ys | y:xs' <- tails xs
--                                , ys <- combinations (n-1) xs']
--     junction2Rel [
--       Relation{relTable=jt, relColumns=jc1, relConstraint=const1, relFTable=t,  relFColumns=c},
--       Relation{             relColumns=jc2, relConstraint=const2, relFTable=ft, relFColumns=fc}
--       ]
--       | jc1 /= jc2 && length jc1 == 1 && length jc2 == 1 = Just $ Relation t c Nothing ft fc M2M (Just $ Junction jt const1 jc1 const2 jc2)
--       | otherwise = Nothing
--     junction2Rel _ = Nothing
--     addMirrorRel = concatMap (\rel@(Relation t c _ ft fc _ (Just (Junction jt const1 jc1 const2 jc2))) ->
--       [rel, Relation ft fc Nothing t c M2M (Just (Junction jt const2 jc2 const1 jc1))])
--
-- addViewPrimaryKeys :: [SourceColumn] -> [PrimaryKey] -> [PrimaryKey]
-- addViewPrimaryKeys srcCols = concatMap (\pk ->
--   let viewPks = (\(_, viewCol) -> PrimaryKey{pkTable=colTable viewCol, pkName=colName viewCol}) <$>
--                 filter (\(col, _) -> colTable col == pkTable pk && colName col == pkName pk) srcCols in
--   pk : viewPks)
--
-- allTables :: H.Statement () [Table]
-- allTables =
--   H.Statement sql HE.noParams decodeTables True
--  where
--   sql = [q|
  all_tables as (
     SELECT
       n.nspname AS table_schema,
       c.relname AS table_name,
       NULL AS table_description,
       (
         c.relkind IN ('r', 'v','f')
         AND (pg_relation_is_updatable(c.oid::regclass, FALSE) & 8) = 8
         OR EXISTS (
           SELECT 1
           FROM pg_trigger
           WHERE
             pg_trigger.tgrelid = c.oid
             AND (pg_trigger.tgtype::integer & 69) = 69
         )
       ) AS insertable
     FROM pg_class c
     JOIN pg_namespace n ON n.oid = c.relnamespace
     WHERE c.relkind IN ('v','r','m','f')
       AND n.nspname NOT IN ('pg_catalog', 'information_schema')
     GROUP BY table_schema, table_name, insertable
     ORDER BY table_schema, table_name
  ),

-- allColumns :: [Table] -> H.Statement [Schema] [Column]
-- allColumns tabs =
--  H.Statement sql (arrayParam HE.text) (decodeColumns tabs) True
--  where
--   sql = [q|
  all_columns as (
     SELECT DISTINCT
         info.table_schema AS schema,
         info.table_name AS table_name,
         info.column_name AS name,
         info.description AS description,
         info.ordinal_position AS position,
         info.is_nullable::boolean AS nullable,
         info.data_type AS col_type,
         info.is_updatable::boolean AS updatable,
         info.character_maximum_length AS max_len,
         info.numeric_precision AS precision,
         info.column_default AS default_value,
         array_to_string(enum_info.vals, ',') AS enum
     FROM (
         -- CTE based on pg_catalog to get PRIMARY/FOREIGN key and UNIQUE columns outside api schema
         WITH key_columns AS (
              SELECT
                r.oid AS r_oid,
                c.oid AS c_oid,
                n.nspname,
                c.relname,
                r.conname,
                r.contype,
                unnest(r.conkey) AS conkey
              FROM
                pg_catalog.pg_constraint r,
                pg_catalog.pg_class c,
                pg_catalog.pg_namespace n
              WHERE
                r.contype IN ('f', 'p', 'u')
                AND c.relkind IN ('r', 'v', 'f', 'm')
                AND r.conrelid = c.oid
                AND c.relnamespace = n.oid
                AND n.nspname <> ANY (ARRAY['pg_catalog', 'information_schema'] || $2)
         ),
         /*
         -- CTE based on information_schema.columns
         -- changed:
         -- remove the owner filter
         -- limit columns to the ones in the api schema or PK/FK columns
         */
         columns AS (
             SELECT
                 nc.nspname::name AS table_schema,
                 c.relname::name AS table_name,
                 a.attname::name AS column_name,
                 d.description AS description,
                 a.attnum::integer AS ordinal_position,
                 pg_get_expr(ad.adbin, ad.adrelid)::text AS column_default,
                 not (a.attnotnull OR t.typtype = 'd' AND t.typnotnull) AS is_nullable,
                     CASE
                         WHEN t.typtype = 'd' THEN
                         CASE
                             WHEN bt.typelem <> 0::oid AND bt.typlen = (-1) THEN 'ARRAY'::text
                             WHEN nbt.nspname = 'pg_catalog'::name THEN format_type(t.typbasetype, NULL::integer)
                             ELSE format_type(a.atttypid, a.atttypmod)
                         END
                         ELSE
                         CASE
                             WHEN t.typelem <> 0::oid AND t.typlen = (-1) THEN 'ARRAY'::text
                             WHEN nt.nspname = 'pg_catalog'::name THEN format_type(a.atttypid, NULL::integer)
                             ELSE format_type(a.atttypid, a.atttypmod)
                         END
                     END::text AS data_type,
                 information_schema._pg_char_max_length(
                     information_schema._pg_truetypid(a.*, t.*),
                     information_schema._pg_truetypmod(a.*, t.*)
                 )::integer AS character_maximum_length,
                 information_schema._pg_numeric_precision(
                     information_schema._pg_truetypid(a.*, t.*),
                     information_schema._pg_truetypmod(a.*, t.*)
                 )::integer AS numeric_precision,
                 COALESCE(bt.typname, t.typname)::name AS udt_name,
                 (
                     c.relkind in ('r', 'v', 'f')
                     AND pg_column_is_updatable(c.oid::regclass, a.attnum, false)
                 )::bool is_updatable
             FROM pg_attribute a
                 LEFT JOIN key_columns kc
                     ON kc.conkey = a.attnum AND kc.c_oid = a.attrelid
                 LEFT JOIN pg_catalog.pg_description AS d
                     ON d.objoid = a.attrelid and d.objsubid = a.attnum
                 LEFT JOIN pg_attrdef ad
                     ON a.attrelid = ad.adrelid AND a.attnum = ad.adnum
                 JOIN (pg_class c JOIN pg_namespace nc ON c.relnamespace = nc.oid)
                     ON a.attrelid = c.oid
                 JOIN (pg_type t JOIN pg_namespace nt ON t.typnamespace = nt.oid)
                     ON a.atttypid = t.oid
                 LEFT JOIN (pg_type bt JOIN pg_namespace nbt ON bt.typnamespace = nbt.oid)
                     ON t.typtype = 'd' AND t.typbasetype = bt.oid
                 LEFT JOIN (pg_collation co JOIN pg_namespace nco ON co.collnamespace = nco.oid)
                     ON a.attcollation = co.oid AND (nco.nspname <> 'pg_catalog'::name OR co.collname <> 'default'::name)
             WHERE
                 NOT pg_is_other_temp_schema(nc.oid)
                 AND a.attnum > 0
                 AND NOT a.attisdropped
                 AND c.relkind in ('r', 'v', 'f', 'm')
                 -- Filter only columns that are FK/PK or in the api schema:
                 AND (nc.nspname = ANY ($2) OR kc.r_oid IS NOT NULL)
         )
         SELECT
             table_schema,
             table_name,
             column_name,
             description,
             ordinal_position,
             is_nullable,
             data_type,
             is_updatable,
             character_maximum_length,
             numeric_precision,
             column_default,
             udt_name
         FROM columns
         WHERE table_schema NOT IN ('pg_catalog', 'information_schema')
     ) AS info
     LEFT OUTER JOIN (
         SELECT
             n.nspname AS s,
             t.typname AS n,
             array_agg(e.enumlabel ORDER BY e.enumsortorder) AS vals
         FROM pg_type t
         JOIN pg_enum e ON t.oid = e.enumtypid
         JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace
         GROUP BY s,n
     ) AS enum_info ON (info.udt_name = enum_info.n)
     ORDER BY schema, position
  ),

-- columnFromRow :: [Table] ->
--                  (Text,        Text,        Text,
--                   Maybe Text,  Int32,       Bool,
--                   Text,        Bool,        Maybe Int32,
--                   Maybe Int32, Maybe Text,  Maybe Text)
--                  -> Maybe Column
-- columnFromRow tabs (s, t, n, desc, pos, nul, typ, u, l, p, d, e) = buildColumn <$> table
--   where
--     buildColumn tbl = Column tbl n desc pos nul typ u l p d (parseEnum e) Nothing
--     table = find (\tbl -> tableSchema tbl == s && tableName tbl == t) tabs
--     parseEnum :: Maybe Text -> [Text]
--     parseEnum = maybe [] (split (==','))
--
-- allM2ORels :: [Table] -> [Column] -> H.Statement () [Relation]
-- allM2ORels tabs cols =
--   H.Statement sql HE.noParams (decodeRels tabs cols) True
--  where
--   sql = [q|

  m2o_rels as (
     SELECT ns1.nspname AS table_schema,
            tab.relname AS table_name,
            conname     AS constraint_name,
            column_info.cols AS columns,
            ns2.nspname AS foreign_table_schema,
            other.relname AS foreign_table_name,
            column_info.refs AS foreign_columns
     FROM pg_constraint,
     LATERAL (
       SELECT array_agg(cols.attname) AS cols,
                     array_agg(cols.attnum)  AS nums,
                     array_agg(refs.attname) AS refs
       FROM ( SELECT unnest(conkey) AS col, unnest(confkey) AS ref) k,
       LATERAL (SELECT * FROM pg_attribute WHERE attrelid = conrelid AND attnum = col) AS cols,
       LATERAL (SELECT * FROM pg_attribute WHERE attrelid = confrelid AND attnum = ref) AS refs) AS column_info,
     LATERAL (SELECT * FROM pg_namespace WHERE pg_namespace.oid = connamespace) AS ns1,
     LATERAL (SELECT * FROM pg_class WHERE pg_class.oid = conrelid) AS tab,
     LATERAL (SELECT * FROM pg_class WHERE pg_class.oid = confrelid) AS other,
     LATERAL (SELECT * FROM pg_namespace WHERE pg_namespace.oid = other.relnamespace) AS ns2
     WHERE confrelid != 0
     ORDER BY (conrelid, column_info.nums)
  ),

-- relFromRow :: [Table] -> [Column] -> (Text, Text, Text, [Text], Text, Text, [Text]) -> Maybe Relation
-- relFromRow allTabs allCols (rs, rt, cn, rcs, frs, frt, frcs) =
--   Relation <$> table <*> cols <*> pure (Just cn) <*> tableF <*> colsF <*> pure M2O <*> pure Nothing
--   where
--     findTable s t = find (\tbl -> tableSchema tbl == s && tableName tbl == t) allTabs
--     findCol s t c = find (\col -> tableSchema (colTable col) == s && tableName (colTable col) == t && colName col == c) allCols
--     table  = findTable rs rt
--     tableF = findTable frs frt
--     cols  = mapM (findCol rs rt) rcs
--     colsF = mapM (findCol frs frt) frcs
--
-- allPrimaryKeys :: [Table] -> H.Statement () [PrimaryKey]
-- allPrimaryKeys tabs =
--   H.Statement sql HE.noParams (decodePks tabs) True
--  where
--   sql = [q|

  primary_keys as (
     -- CTE to replace information_schema.table_constraints to remove owner limit
     WITH tc AS (
         SELECT
             c.conname::name AS constraint_name,
             nr.nspname::name AS table_schema,
             r.relname::name AS table_name
         FROM pg_namespace nc,
             pg_namespace nr,
             pg_constraint c,
             pg_class r
         WHERE
             nc.oid = c.connamespace
             AND nr.oid = r.relnamespace
             AND c.conrelid = r.oid
             AND r.relkind = 'r'
             AND NOT pg_is_other_temp_schema(nr.oid)
             AND c.contype = 'p'
     ),
     -- CTE to replace information_schema.key_column_usage to remove owner limit
     kc AS (
         SELECT
             ss.conname::name AS constraint_name,
             ss.nr_nspname::name AS table_schema,
             ss.relname::name AS table_name,
             a.attname::name AS column_name,
             (ss.x).n::integer AS ordinal_position,
             CASE
                 WHEN ss.contype = 'f' THEN information_schema._pg_index_position(ss.conindid, ss.confkey[(ss.x).n])
                 ELSE NULL::integer
             END::integer AS position_in_unique_constraint
         FROM pg_attribute a,
             ( SELECT r.oid AS roid,
                 r.relname,
                 r.relowner,
                 nc.nspname AS nc_nspname,
                 nr.nspname AS nr_nspname,
                 c.oid AS coid,
                 c.conname,
                 c.contype,
                 c.conindid,
                 c.confkey,
                 information_schema._pg_expandarray(c.conkey) AS x
                FROM pg_namespace nr,
                 pg_class r,
                 pg_namespace nc,
                 pg_constraint c
               WHERE
               nr.oid = r.relnamespace
                 AND r.oid = c.conrelid
                 AND nc.oid = c.connamespace
                 AND c.contype in ('p', 'u', 'f')
                 AND r.relkind = 'r'
                 AND NOT pg_is_other_temp_schema(nr.oid)
             ) ss
         WHERE
           ss.roid = a.attrelid
           AND a.attnum = (ss.x).x
           AND NOT a.attisdropped
     )
     SELECT
         kc.table_schema,
         kc.table_name,
         kc.column_name
     FROM
         tc, kc
     WHERE
         kc.table_name = tc.table_name AND
         kc.table_schema = tc.table_schema AND
         kc.constraint_name = tc.constraint_name AND
         kc.table_schema NOT IN ('pg_catalog', 'information_schema')
  ),

-- pkFromRow :: [Table] -> (Schema, Text, Text) -> Maybe PrimaryKey
-- pkFromRow tabs (s, t, n) = PrimaryKey <$> table <*> pure n
--   where table = find (\tbl -> tableSchema tbl == s && tableName tbl == t) tabs
--
-- allSourceColumns :: [Column] -> PgVersion -> H.Statement [Schema] [SourceColumn]
-- allSourceColumns cols pgVer =
--   H.Statement sql (arrayParam HE.text) (decodeSourceColumns cols) True
--   -- query explanation at https://gist.github.com/steve-chavez/7ee0e6590cddafb532e5f00c46275569
--   where
--     subselectRegex :: Text
--     -- "result" appears when the subselect is used inside "case when", see `authors_have_book_in_decade` fixture
--     -- "resno"  appears in every other case
--     -- when copying the query into pg make sure you omit one backslash from \\d+, it should be like `\d+` for the regex
--     subselectRegex | pgVer < pgVersion100 = ":subselect {.*?:constraintDeps <>} :location \\d+} :res(no|ult)"
--                    | otherwise = ":subselect {.*?:stmt_len 0} :location \\d+} :res(no|ult)"
--     sql = [qc|

  source_columns as (
       with
       views as (
         select
           n.nspname   as view_schema,
           c.relname   as view_name,
           r.ev_action as view_definition
         from pg_class c
         join pg_namespace n on n.oid = c.relnamespace
         join pg_rewrite r on r.ev_class = c.oid
         where c.relkind in ('v', 'm') and n.nspname = ANY ($2)
       ),
       removed_subselects as(
         select
           view_schema, view_name,
           regexp_replace(view_definition, '{subselectRegex}', '', 'g') as x
         from views
       ),
       target_lists as(
         select
           view_schema, view_name,
           regexp_split_to_array(x, 'targetList') as x
         from removed_subselects
       ),
       last_target_list_wo_tail as(
         select
           view_schema, view_name,
           (regexp_split_to_array(x[array_upper(x, 1)], ':onConflict'))[1] as x
         from target_lists
       ),
       target_entries as(
         select
           view_schema, view_name,
           unnest(regexp_split_to_array(x, 'TARGETENTRY')) as entry
         from last_target_list_wo_tail
       ),
       results as(
         select
           view_schema, view_name,
           substring(entry from ':resname (.*?) :') as view_colum_name,
           substring(entry from ':resorigtbl (.*?) :') as resorigtbl,
           substring(entry from ':resorigcol (.*?) :') as resorigcol
         from target_entries
       )
       select
         sch.nspname as table_schema,
         tbl.relname as table_name,
         col.attname as table_column_name,
         res.view_schema,
         res.view_name,
         res.view_colum_name
       from results res
       join pg_class tbl on tbl.oid::text = res.resorigtbl
       join pg_attribute col on col.attrelid = tbl.oid and col.attnum::text = res.resorigcol
       join pg_namespace sch on sch.oid = tbl.relnamespace
       where resorigtbl <> '0'
       order by view_schema, view_name, view_colum_name
  ),

-- getPgVersion :: H.Session PgVersion
-- getPgVersion = H.statement () $ H.Statement sql HE.noParams versionRow False
--   where
  pg_version as (
    SELECT
      current_setting('server_version_num')::integer as server_version_num,
      current_setting('server_version') as server_version
  )
--     versionRow = HD.singleRow $ PgVersion <$> column HD.int4 <*> column HD.text

  select
    json_build_object(
        'procs', procs_agg.array_agg,
        'schema_description', schema_description,
        'accessible_tables', accessible_tables_agg.array_agg,
        'tables', tables_agg.array_agg,
        'columns', columns_agg.array_agg,
        'm2o_rels', m2o_rels_agg.array_agg,
        'primary_keys', primary_keys_agg.array_agg,
        'source_columns', source_columns_agg.array_agg,
        'pg_version', pg_version
    ) as dbstructure
  from
    (select array_agg(procs) from procs) procs_agg,
    schema_description,
    (select array_agg(accessible_tables) from accessible_tables) as accessible_tables_agg,
    (select array_agg(all_tables) from all_tables) as tables_agg,
    (select array_agg(all_columns) from all_columns) as columns_agg,
    (select array_agg(m2o_rels) from m2o_rels) as m2o_rels_agg,
    (select array_agg(primary_keys) from primary_keys) as primary_keys_agg,
    (select array_agg(source_columns) from source_columns) as source_columns_agg,
    pg_version;

execute dbstructure('test', ARRAY['test']::text[]);

out.json

{
  "procs": [
    {
      "proc_schema": "test",
      "proc_name": "varied_arguments",
      "proc_description": "An RPC function\n\nJust a test for RPC function arguments",
      "args": "double double precision, \"varchar\" character varying, \"boolean\" boolean, date date, money money, enum test.enum_menagerie_type, \"integer\" integer DEFAULT 42, json json DEFAULT '{}'::json, jsonb jsonb DEFAULT '{}'::jsonb",
      "rettype_schema": "pg_catalog",
      "rettype_name": "text",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "v"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "hashissn13",
      "proc_description": null,
      "args": "extensions.issn13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "int4",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "btean13cmp",
      "proc_description": null,
      "args": "extensions.ean13, extensions.issn",
      "rettype_schema": "pg_catalog",
      "rettype_name": "int4",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "public",
      "proc_name": "lca",
      "proc_description": null,
      "args": "ltree, ltree, ltree, ltree, ltree, ltree, ltree",
      "rettype_schema": "public",
      "rettype_name": "ltree",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "ismn",
      "proc_description": null,
      "args": "extensions.ean13",
      "rettype_schema": "extensions",
      "rettype_name": "ismn",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "test",
      "proc_name": "sayhello",
      "proc_description": null,
      "args": "name text",
      "rettype_schema": "pg_catalog",
      "rettype_name": "text",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnle",
      "proc_description": null,
      "args": "extensions.ean13, extensions.isbn",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnlt",
      "proc_description": null,
      "args": "extensions.issn13, extensions.ean13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnlt",
      "proc_description": null,
      "args": "extensions.ean13, extensions.isbn",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "public",
      "proc_name": "encrypt",
      "proc_description": null,
      "args": "bytea, bytea, text",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bytea",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "public",
      "proc_name": "lca",
      "proc_description": null,
      "args": "ltree, ltree, ltree, ltree, ltree",
      "rettype_schema": "public",
      "rettype_name": "ltree",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "public",
      "proc_name": "ltree_gt",
      "proc_description": null,
      "args": "ltree, ltree",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "test",
      "proc_name": "welcome.html",
      "proc_description": null,
      "args": "",
      "rettype_schema": "pg_catalog",
      "rettype_name": "text",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "v"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnge",
      "proc_description": null,
      "args": "extensions.ean13, extensions.isbn13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "test",
      "proc_name": "ret_void",
      "proc_description": null,
      "args": "",
      "rettype_schema": "pg_catalog",
      "rettype_name": "void",
      "rettype_is_setof": false,
      "rettype_typ": "p",
      "provolatile": "v"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnne",
      "proc_description": null,
      "args": "extensions.isbn, extensions.isbn",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isngt",
      "proc_description": null,
      "args": "extensions.ean13, extensions.issn13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "public",
      "proc_name": "ltree_same",
      "proc_description": null,
      "args": "ltree_gist, ltree_gist, internal",
      "rettype_schema": "pg_catalog",
      "rettype_name": "internal",
      "rettype_is_setof": false,
      "rettype_typ": "p",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnge",
      "proc_description": null,
      "args": "extensions.ismn13, extensions.ismn",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "public",
      "proc_name": "ltree_gist_in",
      "proc_description": null,
      "args": "cstring",
      "rettype_schema": "public",
      "rettype_name": "ltree_gist",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "hashismn13",
      "proc_description": null,
      "args": "extensions.ismn13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "int4",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnlt",
      "proc_description": null,
      "args": "extensions.ismn, extensions.ean13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnge",
      "proc_description": null,
      "args": "extensions.ean13, extensions.ean13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "btupccmp",
      "proc_description": null,
      "args": "extensions.upc, extensions.ean13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "int4",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnle",
      "proc_description": null,
      "args": "extensions.isbn13, extensions.isbn13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnne",
      "proc_description": null,
      "args": "extensions.ismn, extensions.ismn13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "btisbn13cmp",
      "proc_description": null,
      "args": "extensions.isbn13, extensions.ean13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "int4",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isneq",
      "proc_description": null,
      "args": "extensions.ismn13, extensions.ismn",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isneq",
      "proc_description": null,
      "args": "extensions.isbn, extensions.isbn13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnle",
      "proc_description": null,
      "args": "extensions.ean13, extensions.issn13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "test",
      "proc_name": "getitemrange",
      "proc_description": null,
      "args": "min bigint, max bigint",
      "rettype_schema": "test",
      "rettype_name": "items",
      "rettype_is_setof": true,
      "rettype_typ": "c",
      "provolatile": "v"
    },
    {
      "proc_schema": "public",
      "proc_name": "ltq_regex",
      "proc_description": null,
      "args": "ltree, lquery",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnne",
      "proc_description": null,
      "args": "extensions.ean13, extensions.ismn13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnne",
      "proc_description": null,
      "args": "extensions.ismn, extensions.ean13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "test",
      "proc_name": "ret_rows_with_base64_bin",
      "proc_description": null,
      "args": "",
      "rettype_schema": "test",
      "rettype_name": "images_base64",
      "rettype_is_setof": true,
      "rettype_typ": "c",
      "provolatile": "v"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnge",
      "proc_description": null,
      "args": "extensions.isbn13, extensions.isbn",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "public",
      "proc_name": "_ltree_risparent",
      "proc_description": null,
      "args": "ltree[], ltree",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "test",
      "proc_name": "set_cookie_twice",
      "proc_description": null,
      "args": "",
      "rettype_schema": "pg_catalog",
      "rettype_name": "void",
      "rettype_is_setof": false,
      "rettype_typ": "p",
      "provolatile": "v"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnge",
      "proc_description": null,
      "args": "extensions.ean13, extensions.issn",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnle",
      "proc_description": null,
      "args": "extensions.ean13, extensions.ismn",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "public",
      "proc_name": "pgp_pub_encrypt",
      "proc_description": null,
      "args": "text, bytea, text",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bytea",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "v"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isngt",
      "proc_description": null,
      "args": "extensions.ismn, extensions.ean13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "is_valid",
      "proc_description": null,
      "args": "extensions.ismn13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isngt",
      "proc_description": null,
      "args": "extensions.ismn13, extensions.ismn",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "public",
      "proc_name": "ltree_isparent",
      "proc_description": null,
      "args": "ltree, ltree",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isngt",
      "proc_description": null,
      "args": "extensions.ean13, extensions.upc",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "isnne",
      "proc_description": null,
      "args": "extensions.upc, extensions.ean13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "bool",
      "rettype_is_setof": false,
      "rettype_typ": "b",
      "provolatile": "i"
    },
    {
      "proc_schema": "extensions",
      "proc_name": "ean13_out",
      "proc_description": null,
      "args": "extensions.isbn13",
      "rettype_schema": "pg_catalog",
      "rettype_name": "cstring",
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      "foreign_table_name": "child_entities",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "descendant",
      "constraint_name": "descendant_being_fkey",
      "columns": [
        "being"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "being",
      "foreign_columns": [
        "being"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "being_part",
      "constraint_name": "being_part_being_fkey",
      "columns": [
        "being"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "being",
      "foreign_columns": [
        "being"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "being_part",
      "constraint_name": "being_part_part_fkey",
      "columns": [
        "part"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "part",
      "foreign_columns": [
        "part"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "family_tree",
      "constraint_name": "pptr",
      "columns": [
        "parent"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "family_tree",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "organizations",
      "constraint_name": "organizations_referee_fkey",
      "columns": [
        "referee"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "organizations",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "organizations",
      "constraint_name": "organizations_auditor_fkey",
      "columns": [
        "auditor"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "organizations",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "organizations",
      "constraint_name": "manager",
      "columns": [
        "manager_id"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "managers",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "private",
      "table_name": "books",
      "constraint_name": "books_author_id_fkey",
      "columns": [
        "author_id"
      ],
      "foreign_table_schema": "private",
      "foreign_table_name": "authors",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "private",
      "table_name": "books",
      "constraint_name": "books_first_publisher_id_fkey",
      "columns": [
        "first_publisher_id"
      ],
      "foreign_table_schema": "private",
      "foreign_table_name": "publishers",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "message",
      "constraint_name": "message_sender_fkey",
      "columns": [
        "sender"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "person",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "message",
      "constraint_name": "message_recipient_fkey",
      "columns": [
        "recipient"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "person",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "zone",
      "constraint_name": "zone_space_id_fkey",
      "columns": [
        "space_id"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "space",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "bar",
      "constraint_name": "bar_fooId_fkey",
      "columns": [
        "fooId"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "Foo",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "contract",
      "constraint_name": "contract_last_name_fkey",
      "columns": [
        "id",
        "first_name",
        "last_name",
        "birth_date"
      ],
      "foreign_table_schema": "private",
      "foreign_table_name": "player",
      "foreign_columns": [
        "id",
        "first_name",
        "last_name",
        "birth_date"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "web_content",
      "constraint_name": "web_content_p_web_id_fkey",
      "columns": [
        "p_web_id"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "web_content",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "private",
      "table_name": "referrals",
      "constraint_name": "referrals_link_fkey",
      "columns": [
        "link"
      ],
      "foreign_table_schema": "private",
      "foreign_table_name": "pages",
      "foreign_columns": [
        "link"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "sites",
      "constraint_name": "main_project",
      "columns": [
        "main_project_id"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "big_projects",
      "foreign_columns": [
        "big_project_id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "jobs",
      "constraint_name": "jobs_site_id_fkey",
      "columns": [
        "site_id"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "sites",
      "foreign_columns": [
        "site_id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "jobs",
      "constraint_name": "jobs_big_project_id_fkey",
      "columns": [
        "big_project_id"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "big_projects",
      "foreign_columns": [
        "big_project_id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "whatev_jobs",
      "constraint_name": "whatev_jobs_site_id_1_fkey",
      "columns": [
        "site_id_1"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "whatev_sites",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "whatev_jobs",
      "constraint_name": "whatev_jobs_project_id_1_fkey",
      "columns": [
        "project_id_1"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "whatev_projects",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "whatev_jobs",
      "constraint_name": "whatev_jobs_site_id_2_fkey",
      "columns": [
        "site_id_2"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "whatev_sites",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "whatev_jobs",
      "constraint_name": "whatev_jobs_project_id_2_fkey",
      "columns": [
        "project_id_2"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "whatev_projects",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "agents",
      "constraint_name": "agents_department_id_fkey",
      "columns": [
        "department_id"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "departments",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "departments",
      "constraint_name": "departments_head_id_fkey",
      "columns": [
        "head_id"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "agents",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "activities",
      "constraint_name": "schedule",
      "columns": [
        "schedule_id"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "schedules",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "unit_workdays",
      "constraint_name": "fst_shift",
      "columns": [
        "fst_shift_activity_id",
        "fst_shift_schedule_id"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "activities",
      "foreign_columns": [
        "id",
        "schedule_id"
      ]
    },
    {
      "table_schema": "test",
      "table_name": "unit_workdays",
      "constraint_name": "snd_shift",
      "columns": [
        "snd_shift_activity_id",
        "snd_shift_schedule_id"
      ],
      "foreign_table_schema": "test",
      "foreign_table_name": "activities",
      "foreign_columns": [
        "id",
        "schedule_id"
      ]
    },
    {
      "table_schema": "v1",
      "table_name": "children",
      "constraint_name": "parent",
      "columns": [
        "parent_id"
      ],
      "foreign_table_schema": "v1",
      "foreign_table_name": "parents",
      "foreign_columns": [
        "id"
      ]
    },
    {
      "table_schema": "v2",
      "table_name": "children",
      "constraint_name": "parent",
      "columns": [
        "parent_id"
      ],
      "foreign_table_schema": "v2",
      "foreign_table_name": "parents",
      "foreign_columns": [
        "id"
      ]
    }
  ],
  "primary_keys": [
    {
      "table_schema": "test",
      "table_name": "items",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "items2",
      "column_name": "id"
    },
    {
      "table_schema": "public",
      "table_name": "public_consumers",
      "column_name": "id"
    },
    {
      "table_schema": "public",
      "table_name": "public_orders",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "clients",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "only_pk",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "projects",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "users",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "users_projects",
      "column_name": "project_id"
    },
    {
      "table_schema": "test",
      "table_name": "users_projects",
      "column_name": "user_id"
    },
    {
      "table_schema": "test",
      "table_name": "tasks",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "users_tasks",
      "column_name": "task_id"
    },
    {
      "table_schema": "test",
      "table_name": "users_tasks",
      "column_name": "user_id"
    },
    {
      "table_schema": "test",
      "table_name": "comments",
      "column_name": "id"
    },
    {
      "table_schema": "private",
      "table_name": "articles",
      "column_name": "id"
    },
    {
      "table_schema": "private",
      "table_name": "article_stars",
      "column_name": "article_id"
    },
    {
      "table_schema": "private",
      "table_name": "article_stars",
      "column_name": "user_id"
    },
    {
      "table_schema": "test",
      "table_name": "Escap3e;",
      "column_name": "so6meIdColumn"
    },
    {
      "table_schema": "postgrest",
      "table_name": "auth",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "authors_only",
      "column_name": "secret"
    },
    {
      "table_schema": "test",
      "table_name": "auto_incrementing_pk",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "complex_items",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "compound_pk",
      "column_name": "k1"
    },
    {
      "table_schema": "test",
      "table_name": "compound_pk",
      "column_name": "k2"
    },
    {
      "table_schema": "test",
      "table_name": "simple_pk",
      "column_name": "k"
    },
    {
      "table_schema": "test",
      "table_name": "has_fk",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "menagerie",
      "column_name": "integer"
    },
    {
      "table_schema": "test",
      "table_name": "entities",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "child_entities",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "grandchild_entities",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "ranges",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "being",
      "column_name": "being"
    },
    {
      "table_schema": "test",
      "table_name": "descendant",
      "column_name": "descendant"
    },
    {
      "table_schema": "test",
      "table_name": "part",
      "column_name": "part"
    },
    {
      "table_schema": "test",
      "table_name": "leak",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "employees",
      "column_name": "first_name"
    },
    {
      "table_schema": "test",
      "table_name": "employees",
      "column_name": "last_name"
    },
    {
      "table_schema": "test",
      "table_name": "tiobe_pls",
      "column_name": "name"
    },
    {
      "table_schema": "test",
      "table_name": "family_tree",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "managers",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "organizations",
      "column_name": "id"
    },
    {
      "table_schema": "private",
      "table_name": "authors",
      "column_name": "id"
    },
    {
      "table_schema": "private",
      "table_name": "publishers",
      "column_name": "id"
    },
    {
      "table_schema": "private",
      "table_name": "books",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "person",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "message",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "space",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "zone",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "UnitTest",
      "column_name": "idUnitTest"
    },
    {
      "table_schema": "test",
      "table_name": "json_arr",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "jsonb_test",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "Foo",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "bar",
      "column_name": "id"
    },
    {
      "table_schema": "private",
      "table_name": "player",
      "column_name": "last_name"
    },
    {
      "table_schema": "private",
      "table_name": "player",
      "column_name": "id"
    },
    {
      "table_schema": "private",
      "table_name": "player",
      "column_name": "first_name"
    },
    {
      "table_schema": "private",
      "table_name": "player",
      "column_name": "birth_date"
    },
    {
      "table_schema": "test",
      "table_name": "web_content",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "app_users",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "big_projects",
      "column_name": "big_project_id"
    },
    {
      "table_schema": "test",
      "table_name": "sites",
      "column_name": "site_id"
    },
    {
      "table_schema": "test",
      "table_name": "jobs",
      "column_name": "job_id"
    },
    {
      "table_schema": "test",
      "table_name": "whatev_projects",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "whatev_sites",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "whatev_jobs",
      "column_name": "job_id"
    },
    {
      "table_schema": "test",
      "table_name": "agents",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "departments",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "schedules",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "activities",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "activities",
      "column_name": "schedule_id"
    },
    {
      "table_schema": "test",
      "table_name": "unit_workdays",
      "column_name": "unit_id"
    },
    {
      "table_schema": "test",
      "table_name": "unit_workdays",
      "column_name": "day"
    },
    {
      "table_schema": "private",
      "table_name": "stuff",
      "column_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "loc_test",
      "column_name": "id"
    },
    {
      "table_schema": "v1",
      "table_name": "parents",
      "column_name": "id"
    },
    {
      "table_schema": "v1",
      "table_name": "children",
      "column_name": "id"
    },
    {
      "table_schema": "v2",
      "table_name": "parents",
      "column_name": "id"
    },
    {
      "table_schema": "v2",
      "table_name": "children",
      "column_name": "id"
    },
    {
      "table_schema": "v2",
      "table_name": "another_table",
      "column_name": "id"
    }
  ],
  "source_columns": [
    {
      "table_schema": "private",
      "table_name": "article_stars",
      "table_column_name": "article_id",
      "view_schema": "test",
      "view_name": "articleStars",
      "view_colum_name": "articleId"
    },
    {
      "table_schema": "private",
      "table_name": "article_stars",
      "table_column_name": "created_at",
      "view_schema": "test",
      "view_name": "articleStars",
      "view_colum_name": "createdAt"
    },
    {
      "table_schema": "private",
      "table_name": "article_stars",
      "table_column_name": "user_id",
      "view_schema": "test",
      "view_name": "articleStars",
      "view_colum_name": "userId"
    },
    {
      "table_schema": "private",
      "table_name": "articles",
      "table_column_name": "body",
      "view_schema": "test",
      "view_name": "articles",
      "view_colum_name": "body"
    },
    {
      "table_schema": "private",
      "table_name": "articles",
      "table_column_name": "id",
      "view_schema": "test",
      "view_name": "articles",
      "view_colum_name": "id"
    },
    {
      "table_schema": "private",
      "table_name": "articles",
      "table_column_name": "owner",
      "view_schema": "test",
      "view_name": "articles",
      "view_colum_name": "owner"
    },
    {
      "table_schema": "private",
      "table_name": "authors",
      "table_column_name": "id",
      "view_schema": "test",
      "view_name": "authors",
      "view_colum_name": "id"
    },
    {
      "table_schema": "private",
      "table_name": "authors",
      "table_column_name": "name",
      "view_schema": "test",
      "view_name": "authors",
      "view_colum_name": "name"
    },
    {
      "table_schema": "test",
      "table_name": "sixties_books",
      "table_column_name": "author_id",
      "view_schema": "test",
      "view_name": "authors_have_book_in_decade",
      "view_colum_name": "author_id"
    },
    {
      "table_schema": "test",
      "table_name": "bar",
      "table_column_name": "fooId",
      "view_schema": "test",
      "view_name": "bars",
      "view_colum_name": "fooId"
    },
    {
      "table_schema": "test",
      "table_name": "bar",
      "table_column_name": "id",
      "view_schema": "test",
      "view_name": "bars",
      "view_colum_name": "id"
    },
    {
      "table_schema": "test",
      "table_name": "bar",
      "table_column_name": "name",
      "view_schema": "test",
      "view_name": "bars",
      "view_colum_name": "name"
    },
    {
      "table_schema": "private",
      "table_name": "books",
      "table_column_name": "author_id",
      "view_schema": "test",
      "view_name": "books",
      "view_colum_name": "author_id"
    },
    {
      "table_schema": "private",
      "table_name": "books",
      "table_column_name": "id",
      "view_schema": "test",
      "view_name": "books",
      "view_colum_name": "id"
    },
    {
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}