Ocean: fix active price

[canonbrother]

Summary

Fix missing active price - main issues are wrong key sort ac54bdd and index_block_<start/end> flow ff02de3

• missing active price & next price
• re-correct index_block_<start/end> flow
• db endiannesss conversion
• optimize prices index
• fix /rpc response

Verified

➜  testnet3 curl -s http://localhost:3002/v0/testnet/prices/DFI-USD/feed/active
➜  testnet3 curl -s http://localhost:3002/v0/testnet/prices/DFI-USD/feed/active
{"data":[{"id":"DFI-USD-654840","key":"DFI-USD","sort":"0009fdf8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"2b1792dc6689f327e446991150939d6cf25d9f28b1db8aea81e184603f88528d","height":654840,"time":1633207650,"medianTime":1633207623}},{"id":"DFI-USD-651000","key":"DFI-USD","sort":"0009eef8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"e981648862d05fc58a64ec0465d522fc99fce3fd46658bd8a8d1cb78ac8de4cd","height":651000,"time":1633096024,"medianTime":1633095988}},{"id":"DFI-USD-647160","key":"DFI-USD","sort":"0009dff8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"dc59a91e1d5c0fa92cfdd48f9f9296c76a6dbb52642278f203d978fa3f275615","height":647160,"time":1632970159,"medianTime":1632969655}},{"id":"DFI-USD-643320","key":"DFI-USD","sort":"0009d0f8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"1308accb340961f265926075528fbac18e1098b8736de253f42107d45b38b95b","height":643320,"time":1632860925,"medianTime":1632860863}},{"id":"DFI-USD-639480","key":"DFI-USD","sort":"0009c1f8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"ef067091496da6e99e82a292a90bfee227cd5962a1fd0ad4ccd0aa77479a4aeb","height":639480,"time":1632722886,"medianTime":1632722838}},{"id":"DFI-USD-635640","key":"DFI-USD","sort":"0009b2f8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"9cefc556f58cc01886fa19cde82ba17d058cd598c33540edaae87256a6836bf6","height":635640,"time":1632609633,"medianTime":1632609411}},{"id":"DFI-USD-631800","key":"DFI-USD","sort":"0009a3f8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"62d92115fc7a8950812ccef5810de6895e214742ab003142161807bf94079696","height":631800,"time":1632492848,"medianTime":1632492756}},{"id":"DFI-USD-627960","key":"DFI-USD","sort":"000994f8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"349aa974d8d3ac80f67728ab0a5c6dee657839a181ad6db7fb43450d03689ad4","height":627960,"time":1632377677,"medianTime":1632377646}},{"id":"DFI-USD-674040","key":"DFI-USD","sort":"000a48f8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"9a5915ed8e014fc0c339cfe3c7b798aa74da93521a804b57dabd56a81ef9a849","height":674040,"time":1633780003,"medianTime":1633779941}},{"id":"DFI-USD-670200","key":"DFI-USD","sort":"000a39f8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"615e002c5ea8b236097260ec5fc7bc60c0e259806de0ed488a0427fa01372c8c","height":670200,"time":1633662815,"medianTime":1633662645}},{"id":"DFI-USD-666360","key":"DFI-USD","sort":"000a2af8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"0c08092a56177daf3c4008b855b2b76394a907bce0e15aab94a2d6a73f6bf2fa","height":666360,"time":1633548086,"medianTime":1633547892}},{"id":"DFI-USD-662520","key":"DFI-USD","sort":"000a1bf8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"c13f594c535e47dfeaee5679ba92817aeacba81c9d06808e6044e99d357c1b1a","height":662520,"time":1633433281,"medianTime":1633433271}},{"id":"DFI-USD-658680","key":"DFI-USD","sort":"000a0cf8","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"3a2bd2418d93f390b005c40b98e72300463ca7bf83f99be89f8317148cd61993","height":658680,"time":1633316465,"medianTime":1633315994}},{"id":"DFI-USD-653040","key":"DFI-USD","sort":"0009f6f0","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"64a7fa1ac841bb377544e6d3899003c60eb1b5ac91cfdd70e212df1b0e30fefe","height":653040,"time":1633148189,"medianTime":1633147908}},{"id":"DFI-USD-649200","key":"DFI-USD","sort":"0009e7f0","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"c529e775897f952d014d57ce1907ce557c6568da08241e1b29daa0980b6d0bb7","height":649200,"time":1633038296,"medianTime":1633037956}},{"id":"DFI-USD-645360","key":"DFI-USD","sort":"0009d8f0","active":{"amount":"21176.67000000","weightage":20.0,"oracles":{"active":2,"total":2}},"next":null,"isLive":false,"block":{"hash":"d867bb2cace07a32c12d4f5d45c9ce70f085ed20308cbb2e6e9a43cd39afbf66","height":645360,"time":1632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